BAYHAQI 4765:
from Ibn ʿUmar —
[Machine] I heard a man asking the Messenger of Allah ﷺ while he was on the pulpit, "How should one of us pray at night?" The Prophet ﷺ said, "Pray two units of prayer, then if you fear the approach of dawn, pray one unit of Witr prayer, and it will suffice you for the prayers you have missed."
البيهقي ٤٧٦٥:
عن ابن عمر —
سَمِعْتُ رَجُلًا يَسْأَلُ رَسُولَ اللهِ ﷺ وَهُوَ عَلَى الْمِنْبَرِ كَيْفَ يُصَلِّي أَحَدُنَا بِاللَّيْلِ؟ فَقَالَ النَّبِيُّ ﷺ مَثْنَى مَثْنَى فَإِذَا خَشِيتَ الصُّبْحَ فَأَوْتِرْ بِوَاحِدَةٍ تُوتِرُ لَكَ مَا مَضَى مِنْ صَلَاتِكَ
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