Musnad Ahmad 27:1162

'Abd al-Razzaq narrated to us, Ibn Jurayj informed us, Nafi' informed me, 'Abdullah ibn 'Umar narrated to us, that the Messenger of Allah (may Allah bless him and grant him peace) was occupied away from it [the prayer] one night, so he delayed it until we slept in the mosque. Then we woke up, then we slept, then we woke up, then we slept, then we woke up. Then the Messenger of Allah (may Allah bless him and grant him peace) came out to us. Then he said: "There is no one among the people of the earth tonight waiting for the prayer except you."