زَادَ اَلْبُخَارِيُّ: «يُومِئُ بِرَأْسِهِ، وَلَمْ يَكُنْ يَصْنَعُهُ فِي اَلْمَكْتُوبَةِ»
“Making gestures with his head and he did not do that (pray while mounted) with obligatory prayers.”
Bulugh al-Maram 254, Book 2, The Book of Prayer, Hadith 75. 1 min read