Mishkat al-Masabih 19 Jihad كتاب الجهاد 113

وَعَن أنسٍ: أَنَّهُ أَقْبَلَ هُوَ وَأَبُو طَلْحَةَ مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَمَعَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ صَفِيَّةُ مُرْدِفَهَا عَلَى رَاحِلَته. رَوَاهُ البُخَارِيّ

Anas told that he and Abu Talha arrived with God’s Messenger who had Safiya riding behind him on his mount. Bukhari transmitted it.