Sayyiduna Ibn Umar (may Allah be pleased with them both) said: A man asked the Messenger of Allah (peace and blessings be upon him) about the night prayer, so he (peace be upon him) said: "It is two by two rak‘ahs, then when one fears that morning is near, he should pray one rak‘ah, and that will make what he has prayed odd (witr)." Imam Darimi (may Allah have mercy on him) was asked: Do you also say this? He said: Yes. (That is, praying one rak‘ah of witr is correct.)