Musannaf Ibn Abi Shayba 3:1051

Abu Bakr narrated to us, he said: Abd al-Aziz ibn Muhammad al-Darawardi narrated to us, from Zayd ibn Aslam, he said: The companions of the Prophet, may Allah bless him and grant him peace, used to enter the mosque and then leave without praying. And I saw Ibn Umar doing that.