"The Messenger of Allah commanded me to pray two Rakahs of Duah,nt to sleep until after praying Witr and to fast three days of each month. (Sahih).
أَمَرَنِي رَسُولُ اللَّهِ ﷺ بِرَكْعَتَىِ الضُّحَى وَأَنْ لاَ أَنَامَ إِلاَّ عَلَى وِتْرٍ وَصِيَامِ ثَلاَثَةِ أَيَّامٍ مِنْ كُلِّ شَهْرٍ