Musannaf Ibn Abi Shaybah 3552 — Informing the imam and the ruler

Mujahid said: When Sayyiduna Umar (may Allah be pleased with him) came to Makkah, Sayyiduna Abu Mahdhurah (may Allah be pleased with him), having already given the adhan, came to him and said: "O Commander of the Believers, it is time for prayer. Hayya 'ala al-salah, hayya 'ala al-salah, hayya 'ala al-falah, hayya 'ala al-falah (Come to prayer, come to prayer; come to success, come to success)." At this Sayyiduna Umar said: "Are you mad? Was the call you have already given not enough for us to come to the mosque?"