Istighfar and the remembrances of tasbih, tahmid, tahlil and takbir, with the duas for sins and for the end of a gathering. Each page names its source.
There is not any slave of Allah who commits a sin, then he perfects his purification and stands to pray two Rak'ahs of prayer, then seeks Allah's forgiveness, except that Allah will forgive him.
Abu Dawud 2/86
Ibn Umar (ra) said: Allah's Messenger (ﷺ) used to repeat in a single sitting: Rabbigh’fir lī wa tub `alayy innaka antat-Tawwābu ‘l-Ghafūr.
Ibn Umar (ra) said: Allah's Messenger (ﷺ) used to repeat in a single sitting: My Lord, forgive me, and accept my repentance, You are the Ever-Relenting, the All-Forgiving.
Ibn Majah 2/321
Subḥānaka Allāhumma wa-bi-ḥamdik, ashhadu an lā ilāha illā ant, astaghfiruka wa-atūbu ilayk.
Glory is to You, O Allah, and praise is to You. I bear witness that there is none worthy of worship but You. I seek Your forgiveness and repent to You.
At-Tirmidhi 3/153
Walaka
And you.
Ahmad 5/82
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Allah's Messenger (ﷺ) said: "By Allah, I seek the forgiveness of Allah, and repent to Him more than seventy times in a day.
Al-Bukhari
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Allah's Messenger (ﷺ) said: "O people, repent to Allah, for I verily repent to Him one hundred times a day.
Muslim 4/2076
Allah's Messenger (ﷺ) said: Whoever says: Astaghfirullāha ‘l-'Aẓīm alladhi lā ilāha illā huwa ‘l-ḥayyul-Qayyūm wa atūbu ilayh.
Allah's Messenger (ﷺ) said: Whoever says: I seek the forgiveness of Allah the Mighty, Whom there is none worthy of worship except Him, the Living, the Eternal, and I repent to Him, Allah will forgive him even if he has deserted the army's ranks.
Abu Dawud 2/85
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Allah's Messenger (ﷺ) said: "The closest that the Lord comes to the slave is in the last portion of the night. So, if you are able to be among those who remember Allah in this hour, then be among them."
At-Tirmidhi, An-Nasa'i 1/279
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Allah's Messenger (ﷺ) said: "The closest that the slave comes to his Lord is when he is prostrating, so invoke Allah much (in prostration)."
Muslim 1/350
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Allah's Messenger (ﷺ) said: "It is a heavy thing for my heart if I do not seek Allah's forgiveness a hundred times a day."
Muslim 4/2075
Allah's Messenger (ﷺ) said: Whoever says: Subḥānallāhi wa biḥamdihi. one hundred times a day, will have his sins forgiven even if they are like the foam of the sea.
Allah's Messenger (ﷺ) said: Whoever says: Glorified is Allah and praised is He. one hundred times a day, will have his sins forgiven even if they are like the foam of the sea.
Al-Bukhari 7/168
Allah's Messenger (ﷺ) said: Whoever says: Lā ilāha illallāh waḥdahu lā sharīka lah, lahu ‘l-mulku wa lahu ‘l-ḥamd wa huwa `alā kulli shay'in Qadīr. ten times, will have the reward for freeing four slaves from the Children of Isma'il.
Allah's Messenger (ﷺ) said: Whoever says: None has the right to be worshipped but Allah alone, Who has no partner. His is the dominion and His is the praise, and He is Able to do all things. ten times, will have the reward for freeing four slaves from the Children of Isma'il.
Al-Bukhari 7/67
Allah's Messenger (ﷺ) said: Two words are light on the tongue, weigh heavily in the balance, and are loved by the Most Merciful One: Subḥānallāhi wa biḥamdih, Subḥānallāhi ‘l-`Aẓīm.
Allah's Messenger (ﷺ) said: Two words are light on the tongue, weigh heavily in the balance, and are loved by the Most Merciful One: Glorified is Allah and praised is He, Glorified is Allah the Most Great.
Al-Bukhari 7/168
Allah's Messenger (ﷺ) said: For me to say: Subḥānallāh, walḥamdu lillāh, wa lā ilāha illallāh, wallāhu 'Akbar is dearer to me than all that the sun rises upon (i.e. the whole world).
Allah's Messenger (ﷺ) said: For me to say: Glory is to Allah, and praise is to Allah, and there is none worthy of worship but Allah, and Allah is the Most Great. is dearer to me than all that the sun rises upon (i.e. the whole world).
Muslim 4/2072
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Allah's Messenger (ﷺ) said: "Is anyone of you incapable of earning one thousand Hasanah (rewards) in a day?" Someone from his gathering asked, "How can anyone of us earn a thousand Hasanah?" He said, "Glorify Allah a hundred times and a thousand Hasanah will be written for you, or a thousand sins will be wiped away."
Muslim 4/2073
Whoever says: Subḥānallāhi ‘l-'Aẓīmi wa biḥamdih will have a date palm planted for him in Paradise.
Whoever says: Glorified is Allah the Most Great and praised is He. will have a date palm planted for him in Paradise.
At-Tirmidhi 5/511
Allah's Messenger (ﷺ) said: "O Abdullah bin Qais, should I not point you to one of the treasures of Paradise?" I said, "Yes, O Messenger of Allah." So he told me to say: Lā ḥawla wa lā quwwata 'illā billāh.
Allah's Messenger (ﷺ) said: "O Abdullah bin Qais, should I not point you to one of the treasures of Paradise?" I said, "Yes, O Messenger of Allah." So he told me to say: There is no power and no might except by Allah.
Muslim 4/2076
Allah's Messenger (ﷺ) said: The most beloved words to Allah are four: Subḥānallāh Walḥamdu lillāh. Wa lā ilāha illallāh Wallāhu Akbar.
Allah's Messenger (ﷺ) said: The most beloved words to Allah are four: Glorified is Allah, and The praise is for Allah, and There is none worthy of worship but Allah, and Allah is the Most Great.
Muslim 3/1685
A desert Arab came to Allah's Messenger (ﷺ) and said, "Teach me a word that I can say. " The Prophet (ﷺ) told him to say: Lā ilāha illallāh waḥdahu lā sharīka lah, Allāhu Akbaru kabīra, walḥamdu lillāhi kathīra, Subḥānallāhi Rabbil-`ālamīn, Lā ḥawla wa lā quwwata illā billāhi ‘l-`Azīzil-Hakīm. He said, "That is for my Lord, but what about me?" The Prophet (ﷺ) told him to say: Allāhummaghfir lī, warḥamnī, waḥdinī warzuqnī.
A desert Arab came to Allah's Messenger (ﷺ) and said, "Teach me a word that I can say. " The Prophet (ﷺ) told him to say: There is none worthy of worship but Allah, Who has no partner, Allah is the Great, the Most Great, and praise is to Allah in abundance, glory is to Allah, Lord of the worlds. There is no power and no might but by Allah the Mighty, the Wise. He said, "That is for my Lord, but what about me?" The Prophet (ﷺ) told him to say: O Allah forgive me, and have mercy on me and guide me, and provide for me.
Muslim 4/2072
Whenever anyone accepted Islam, the Prophet (ﷺ) used to teach him how to pray then he would instruct him to invoke Allah with the following words: Allāhummaghfir lī, warḥamnī, waḥdinī, wa `āfinī warzuqnī.
Whenever anyone accepted Islam, the Prophet (ﷺ) used to teach him how to pray then he would instruct him to invoke Allah with the following words: O Allah forgive me, and have mercy on me and guide me and give me good health and provide for me.
Muslim 4/2073
The most excellent invocation is: Alḥamdulillāh and the most excellent words of remembrance are: Lā ilāha illallāh.
The most excellent invocation is: Praise is for Allah. and the most excellent words of remembrance are: There is none worthy of worship but Allah.
At-Tirmidhi 5/462
The good deeds which endure are: Subḥānallāh. Walḥamdu lillāh. Wa lā ilāha illallāh Wallāhu Akbar Wa lā ḥawla wa lā quwwata illā billāh.
The good deeds which endure are: Glorified is Allah, and The praise is for Allah, and There is none worthy of worship but Allah, and Allah is the Most Great, and There is no power and no might except by Allah.
Ahmad
Abdullah bin 'Amr (RA) said: "I saw the Prophet (ﷺ) counting the glorification of his Lord on his right hand."
Abu Dawud with a different wording 2/81