Sunan at-Tirmidhi (Jami-al-Tirmidhi), Chapter: Salah (Prayers)

from his father who from his grandfather that they were with the Prophet in a journey. They came to a very narrow pass when it was time for salah. The heaven poured down rain from above and there was damp mud below them. So Allah's Messenger called the adhan while he was on his riding beast and then called the iqamah. Then he pulled his riding beast shead. Then he lead them in prayer, in gestures. He bowed down more in sajdah than in ruku'. [Ahmed 17584]