On a certain occasion the Prophet (s.a.a.w.) was travelling on his camel over hilly terrain with a disciple, Uqba Bin Aamir. After going some distance, he asked Uqba to ride the camel, but Uqba thought this would be showing disrespect to the Prophet (s.a.a.w.). But the Prophet (s.a.a.w.) insisted and he had to comply. The Prophet (s.a.a.w.) himself walked on foot as he did not want to put too much load on the animal. [Nasai]
(6:59) He has the keys to the realm that lies beyond the reach of human perception; none knows them but He. And He knows what is on the land and in the sea; there is not a leaf which falls that He does not know about and there is not a grain in the darkness of the earth or anything green or dry which has not been recorded in a Clear Book.