Sunan Abi Dawud Book 2, Hadith 222
Get up, I shall lead you in prayer. Anas said: I got up and took a mat which had become black on account of long use. I then washed it with water. The Messenger of Allah (ﷺ) stood upon it. I and the orphan (Ibn Abi Dumairah, the freed slave of the prophet) stood in a row behind him. The old women stood behind us. He then led us in two raka'at of prayer and left.
“He took my head or the hair of my head and made me stand on his right side”.
Alqamah and al-Aswad sought permission from Abdullah (ibn Mas'ud) for admission, and we remained sitting at his door for a long time. A slave-girl came out and gave them permission (to enter). He (Ibn Mas'ud) then got up and prayed (standing) between me (al-Aswad) and him (Alqamah). He then said: I witnessed the Messenger of Allah (ﷺ) doing similarly.