Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) used to say: Whoever prays at night should perform Witr as the last prayer before dawn, because the Messenger of Allah (peace and blessings be upon him) used to command them to do so. Ibn Yahya says: Hajjaj narrated both these reports in the same manner.
Hadith Referenceالمنتقى ابن الجارود / كتاب الصلاة / 275
Hadith Gradingغلام مصطفےٰ ظهير امن پوري:صحيح
Hadith Takhrijاز غلام مصطفےٰ ظهير امن پوري:«صحيح مسلم : 751/152»