Narrated Samurah bin Jundub (RA):

The Prophet (ﷺ) used to ask for (Allah's) forgiveness for the believing men and believing women, every al-Jumu'ah (Friday prayer). [al-Bazzar reported it through a weak chain of narrators].

وَعَنْ سَمُرَةَ بنِ جُنْدُبٍ ‏- رضى الله عنه ‏- { أَنَّ اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-كَانَ يَسْتَغْفِرُ لِلْمُؤْمِنِينَ وَالْمُؤْمِنَاتِ كُلَّ جُمُعَةٍ } رَوَاهُ اَلْبَزَّارُ بِإِسْنَادٍ لَيِّن ٍ [1]‏ .‏