al-Walid bin 'Abdur Rahman الوليد بن عبد الرحمن الجرشي · The Book on Fasting

"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…