"Whoever prays during the night, let him make the last of his prayers at night witr, because the Messenger of Allah ﷺ used to enjoin that." (Using translation from Nasāʾī 1682)
وَمَنْ صَلَّى مِنْ أَوَّلِ اللَّيْلِ فَلْيَجْعَلْ آخِرَ صَلَاتِهِ وِتْرًا فَإِنَّ رَسُولَ اللهِ ﷺ كَانَ يَأْمُرُ بِذَلِكَ