Mishkat al-Masabih 10 The Rites of Pilgrimage كتاب المناسك 177

وَعَنْ أُمِّ الْحُصَيْنِ قَالَتْ: رَأَيْتُ أُسَامَةَ وَبِلَالًا وَأَحَدُهُمَا آخِذٌ بِخِطَامِ نَاقَةِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَالْآخَرُ رَافِعٌ ثَوْبَهُ يَسْتُرُهُ من الْحَرِّ حَتَّى رَمَى جَمْرَةَ الْعَقَبَةِ. رَوَاهُ مُسْلِمٌ

Umm al-Husain said she saw Usama and Bilal, one of them holding the halter of God’s messenger’s she-camel, while the other raised his garment and sheltered him from the heat till he had thrown pebbles at the jamra of the ‘Aqaba. Muslim transmitted it.