Mukhtasar Muslim

´Sayyiduna Abu Burdah bin Abi Musa Ash'ari رضي الله عنه said that` Sayyiduna Abdullah bin Umar رضي الله عنهما said to me, "Have you heard anything from your father about the hour of Jumu'ah which he narrated from the Messenger of Allah صلى الله عليه وسلم?" I said, "Yes, I heard from him." He used to say that I heard the Messenger of Allah صلى الله عليه وسلم say, "That hour is from when the Imam sits down for the sermon until the prayer is offered."