(25) باب صَلاَةِ اللَّيْلِ مَثْنَى مَثْنَى
Narrated 'Abdullah bin 'Umar:
A man asked the Messenger of Allah (ﷺ) about the prayer at night. The Messenger of Allah (ﷺ) said: Prayer during the night should consist of pairs of rak'ahs, but if one of you fears the morning is near he should pray one rak'ah which will make his prayer an odd number for him.
Reference: Sunan Abi Dawud 1326
In-book reference: Book 5, Hadith 77
English translation: Book 5, Hadith 1321