"The Messenger of Allah enjoyed three things upon me: To sleep after praying Witr, to perform Ghusal on Friday, and to fast three days of each month." (Sahih). (Using translation from Nasāʾī 2405)
أَمَرَنِي نَبِيُّ اللهِ ﷺ بِثَلَاثٍ «نَوْمٌ عَلَى وِتْرٍ وَغُسْلٌ يَوْمَ الْجُمُعَةِ وَصِيَامُ ثَلَاثَةِ أَيَّامٍ مِنْ كُلِّ شَهْرٍ»