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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai-kubra:10202 – Ibrāhīm b. Yaʿqūb > Abū Nuʿaym > Mughīrah b. Abū al-Ḥar al-Kindī > Saʿīd b. Abū Burdah from his father from his grandfather

[Machine] The Messenger of Allah ﷺ came while we were sitting and he said, "I have never started a day without seeking forgiveness from Allah one hundred times."  

الكبرى للنسائي:١٠٢٠٢ – أَخْبَرَنِي إِبْرَاهِيمُ بْنُ يَعْقُوبَ حَدَّثَنَا أَبُو نُعَيْمٍ حَدَّثَنَا مُغِيرَةُ بْنُ أَبِي الْحَرِّ الْكِنْدِيُّ عَنْ سَعِيدِ بْنِ أَبِي بُرْدَةَ عَنْ أَبِيهِ عَنْ جَدِّهِ قَالَ

جَاءَ رَسُولُ اللهِ ﷺ وَنَحْنُ جُلُوسٌ فَقَالَ «مَا أَصْبَحْتُ غَدَاةً قَطُّ إِلَّا اسْتَغْفَرْتُ اللهَ فِيهَا مِائَةَ مَرَّةٍ»  

See similar narrations below:

Collected by Suyūṭī