Musannaf Ibn Abi Shayba 3:883

Hussain bin Ali narrated to us, from Za’idah, from Abu Hasin, from Kharashah, who said: Umar bin al-Mughirah led the people in prayer. He prayed in the darkness of the end of the night (ghalas), and he prayed in the light of the morning (nur), and he prayed with them in between that.