Yahya related to me from Malik from Ibn Shihab from Ubaydullah
ibn Abdullah ibn Utba ibn Masud that Abdullah ibn Abbas said, "I
approached, riding on a donkey, while the Messenger of Allah, may
Allah bless him and grant him peace, was leading the people in prayer
at Mina, and I was, at that time, nearing puberty. I passed in front
of part of the row, dismounted, sent the donkey off to graze, and then
joined the row, and no one rebuked me for doing so."
Muwatta Malik Book 9, Hadith 43