Musannaf Ibn Abi Shayba 3:4549

Abu Bakr narrated to us, he said: Ishaq bin Sulayman narrated to us, from Abu Sinan, from ‘Amr bin Murrah, from Sa’id bin Jubayr, that a man asked him about a man who performs Witr and then prays. He said: He sleeps, then he prays.