During the months of Dhu al-Hijjah...

During the months of Dhu al-Hijjah, al-Muharram, Safar, Rabi’ al-Awwal, which are four months, good deeds are written for him. No evil deed is written against him until he commits one (a major sin). After these four months pass, he is mixed with people.’”

ختلف فيه - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (17/124))