Musannaf Ibn Abi Shayba 36:391

'Abd al-Wahhab al-Thaqafi narrated to us, from Ayyub, from Ibn Abi Mulayka, who said: When Mecca was conquered, Bilal climbed the House (the Ka'bah) and gave the adhan. Safwan ibn Umayya said to al-Harith ibn Hisham, "Do you not see this slave?" Al-Harith said, "If Allah dislikes him, He will change him."