Jami` at-Tirmidhi 806

Abu Dharr narrated:"We fasted with the Prophet, so he did not pray (the night prayer) with us until seven (nights) of the month remained. Then he (pbuh) led us in prayer until a third of the night had gone, then he did not lead us in prayer on the sixth. Then he led us in prayer on the fifth until half of the night had gone. We said to him: 'O Messenger of Allah! Wouldn't you lead us in prayer for the remainder of the night?' He said: 'Indeed, whoever stands (praying) with the Imam until he finished, then it is recorded for him that he prayed the whole night.; Then he did not lead us in prayer until three (nights) of the month remained. Then he led us in prayer on the third and he called his family and his women to pray with us until we feared missing the Falah" I (Jubair bin Nufair) said to him: "What is the Falah" He said: "The Suhur