A man asked the Messenger of Allah ﷺ about prayers at night. The Messenger of Allah ﷺ said: "prayers at night are (offered) two by two, then if you fear that dawn will come, pray witr with one." (Using translation from Nasāʾī 1673)
أَخْبَرَهُ أَنَّ رَجُلًا سَأَلَ رَسُولَ اللهِ ﷺ عَنْ صَلَاةِ اللَّيْلِ؟ فَقَالَ رَسُولُ اللهِ ﷺ صَلَاةُ اللَّيْلِ مَثْنَى مَثْنَى فَإِذَا خَشِيتَ الصُّبْحَ فَأَوْتِرْ بِوَاحِدَةٍ