Musannaf Ibn Abi Shayba 3:3545

Waki’ narrated to us, he said: Musa ibn ‘Ubaydah narrated to us, from his brother ‘Abdullah ibn ‘Ubaydah, from ‘Abdullah ibn ‘Umar, he said: The prayer of the *awwabin* (the oft-returning) is between the time the people of Maghrib turn away until the call is made for Isha.