Musannaf Ibn Abi Shaybah 8168 — The imam standing in a corner

Mughirah bin Ziyad al-Mawsili said: I saw Ata leading the prayer standing under a canopy in al-Masjid al-Haram, while the people were standing scattered away from the rows. I said to him, or it was said to him, and he said: I am an old man, and Makkah is a dry and hot place. The Prophet (peace and blessings be upon him) was on a journey when it rained, so he led the people in prayer while they were in their lodgings, and Sayyiduna Bilal (may Allah be pleased with him) was conveying the takbir to them.