(12) باب اسْتِحْبَابِ الاِسْتِغْفَارِ وَالاِسْتِكْثَارِ مِنْهُ
Al-Agharr al-Muzani who was from amongst the Companions of Allah's Apostle (ﷺ) reported that Ibn 'Umar stated to him that Allah's Messenger (may peace 'be upon him) said:
O people, seek repentance from Allah. Verily, I seek repentance from Him a hundred times a day.
Reference: Sahih Muslim 2702 b
In-book reference: Book 48, Hadith 53
USC-MSA web (English) reference(deprecated numbering scheme): Book 35, Hadith 6523