once
قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم: ((وَاللَّهِ إِنِّي لأَسْتَغفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ فِي الْيَوْمِ أَكْثَرَ مِنْ سَبْعِينَ مَرَّةٍ)).
Meaning
The Messenger of Allah said: ‘By Allah, I seek forgiveness and repent to Allah, more than seventy times a day.
Source and references
Hisn al-Muslim, entry 248.The reference is copied from the edition; separate editorial verification is not complete yet.
Source edition: Fortress of the Muslim. Open source ↗