Abu Bakr ibn Abi Shaybah, 'Amr al-Naqid, Zuhayr ibn Harb, and Ishaq ibn Ibrahim narrated to us — and the wording is that of 'Amr. Ishaq said: "We were informed," while the others said: "Waki' narrated to us, from Ja'far ibn Burqan, from Yazid ibn al-Asamm, from Maymunah bint al-Harith, who said: When the Messenger of Allah (peace and blessings be upon him) prostrated, he would keep his arms apart from his sides so much that those behind him could see the whiteness of his armpits." Waki' said: meaning their whiteness.