Musannaf Ibn Abi Shaybah 2329 — One who calls the adhan at night: does

Abu Musa said: Those people who used to call the Fajr adhan during the night were mentioned in the presence of al-Hasan. He said: "They are idle non-Arab louts; they pray only with the iqamah. Had Sayyiduna Umar come across them, he would have beaten them painfully, or struck them on their heads."