Allah, glorified be He, has told us of the repentance of Adam, Noah, and those who came after them, down to the last of the messengers, Muhammad, may Allah bless him and grant him peace. The last revelation he received—or among the last—was His saying, Most High:

“When Allah’s help comes and victory,
and you see people entering Allah’s religion in multitudes,
then glorify your Lord with praise and seek His forgiveness. Indeed, He is ever Accepting of repentance.”

In the two Sahīhs, ʿĀʾishah, may Allah be pleased with her, relates that the Prophet, may Allah bless him and grant him peace, would frequently say while bowing and prostrating: “Glory be to You, O Allah, our Lord, and praise be to You. O Allah, forgive me.” He was thereby putting the Quran into practice.

Before that, Allah had revealed to him:

“Allah has indeed turned in mercy to the Prophet, the Emigrants, and the Helpers who followed him in the hour of hardship, after the hearts of some of them had almost swerved. Then He turned to them in mercy. Indeed, He is Most Kind and Most Merciful to them.”

In Sahīh al-Bukhārī, it is reported that the Prophet, may Allah bless him and grant him peace, used to say:

“O people, repent to your Lord. By Him in whose hand is my soul, I seek Allah’s forgiveness and repent to Him more than seventy times a day.”

In Sahīh Muslim, al-Agharr al-Muzanī reports that the Prophet, may Allah bless him and grant him peace, said:

“A veil comes over my heart, and I seek Allah’s forgiveness one hundred times a day.”

In the Sunan collections, Ibn ʿUmar said: We would count the Messenger of Allah, may Allah bless him and grant him peace, saying one hundred times in a single gathering: “My Lord, forgive me and accept my repentance. Indeed, You are the Accepter of repentance, the All-Forgiving.”

In the two Sahīhs, Abū Mūsā reports that the Prophet, may Allah bless him and grant him peace, used to