The Book of Prayers (Kitab Al-Salat)

Muslim :: Book 4 : Hadith 1633

Salim reported on the authority of his father that a person asked the Apostle of Allah (may peace be upon him) about the night prayer. He said: It consists of pairs of rak'ahs, but if one fears morning is near, he should make it an odd number by praying one rak'ah.