Sunan Abi Dawud 446
سنن أبي داود#446Da'ifThis tradition has also been transmitted through another chain of narrators by Dhu Mikhbar, the nephew of the Negus. This version adds:"He (Bilal) called for prayer unhurriedly
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniShadh
Muhammad Muhyi Al-Din Abdul HamidShadh
Zubair Ali ZaiDaif
In-book reference: 2:56