Musannaf Ibn Abi Shayba 13:2717

Abu Bakr narrated to us, he said: Ghundar narrated to us, from Imran bin Hudayr, from Ikrimah, that it was said to him: "Ibn Umar used to seek permission [to enter] the shops of the marketplace." He said: "And who can endure what Ibn Umar used to endure?"