Musannaf Ibn Abi Shayba 3:3016

Abu Bakr narrated to us, he said: Hushaym narrated to us, he said: Hisham informed us, from Ibn Sirin, from Zayd ibn Thabit, that he went out for the Friday prayer, and behold, the people had already turned back and had finished praying. He said: So he inclined toward the mosque, or toward a house, and prayed. He said: It was said to him regarding that, so he said: "Indeed, whoever is not ashamed before the people is not ashamed before Allah."