وَيَنْبَغِي لِلْإِمَامِ أَنْ يَقِفَ بِعَرَفَةَ عَلَى رَاحِلَتِهِ، يَدْعُو، وَيُعَلِّمُ النَّاسَ الْمَنَاسِكَ.
Translation: It is appropriate for the imam to stand at Arafat on his mount, supplicate, and teach the people the rites.
Rāḥilah means a riding mount. In the historical setting, being mounted helped the imam address and guide the crowd; this is not a condition requiring every pilgrim to ride an animal.
The passage emphasizes the imam's supplication and his instruction in the rites.