Musannaf Ibn Abi Shayba 4:77

Ziyad ibn al-Rabi‘—and he was trustworthy—narrated to us, from Abu Hamza (Jamra) al-Duba‘i: That he used to break his fast with Ibn Abbas during Ramadan. When evening approached, he would send a stepson of his to climb onto the roof of the house. When the sun set, he would give the call to prayer, so he would eat and we would eat. When he finished, the prayer would be established, so he would stand and pray, and we would pray with him.