IBNMAJAH 3816:
from Saʿīd b. Abū Burdah b. Abū Mūsá from his father from his grandfather —
his grandfather said: "The Messenger of Allah (saas) said: 'I seek the forgivenenss of Allah and repent to Him seventy times each day.'"
ابن ماجة ٣٨١٦:
عن سعيد بن ابو برده بن ابو موسى عن أبيه عن جده —
قَالَ رَسُولُ اللَّهِ ﷺ إِنِّي لأَسْتَغْفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ فِي الْيَوْمِ سَبْعِينَ مَرَّةً