Musannaf Ibn Abi Shayba 3:3087

Hushaym narrated to us, from Mughirah, from Wasil, from Abu Burdah, who said: I was with Ibn Umar when he was asked about the hour [of response] on Friday. I said: "It is the hour for which, or in which, Allah chose the prayer." He said: He wiped my head, invoked blessings upon me, and was pleased with what I said.