Musannaf Ibn Abi Shayba 2:190

Abu Bakr narrated to us, he said: Abu Khalid narrated to us, from Ash'ath, from al-Hasan, who said: Bilal gave the adhan at night. The Prophet (peace be upon him) ordered him to call out: "Verily, the servant has slept." So he returned and called out: "The servant has slept," while he was saying: "I wish Bilal’s mother had not given birth to him," and he was moist from the sweat of his forehead. He said: And it reached us that he ordered him to repeat the adhan.