Muwatta Imam Malik Book of Shortening the Prayer, Hadith 41

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 ﷺ 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."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ عُتْبَةَ بْنِ مَسْعُودٍ، عَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ، أَنَّهُ قَالَ أَقْبَلْتُ رَاكِبًا عَلَى أَتَانٍ - وَأَنَا يَوْمَئِذٍ قَدْ نَاهَزْتُ الاِحْتِلاَمَ - وَرَسُولُ اللَّهِ ﷺ يُصَلِّي لِلنَّاسِ بِمِنًى فَمَرَرْتُ بَيْنَ يَدَىْ بَعْضِ الصَّفِّ فَنَزَلْتُ فَأَرْسَلْتُ الأَتَانَ تَرْتَعُ وَدَخَلْتُ فِي الصَّفِّ فَلَمْ يُنْكِرْ ذَلِكَ عَلَىَّ أَحَدٌ .