Musannaf Ibn Abi Shaybah 4145 — A man who enters while the muezzin

Sufyan bin Uyaynah said: Ubaydullah bin Abi Yazid saw Sayyiduna Husayn bin Ali (may Allah be pleased with him) at the basin of Zamzam, and then the iqamah was called for the prayer. Some words then passed between the imam and some of the people. The caller kept saying: "The prayer has been established," and the people kept telling him to sit down, and he would again say: "The prayer has been established."