Ubaydullah bin Abdullah bin Abbas said: We were sitting with Sayyiduna Ibn Abbas (may Allah be pleased with them both) among some young men of Banu Hashim, and a man asked him: Did the Messenger of Allah (peace and blessings be upon him) recite in Zuhr and Asr? He said: No. The man said: Perhaps he (peace and blessings be upon him) recited inwardly.
He said: The Messenger of Allah (peace and blessings be upon him) was a servant who was given a command and he conveyed it. By Allah, he (peace and blessings be upon him) did not single us out above the people in anything except three things: he ordered us to perform ablution thoroughly, he ordered us not to eat charity (sadaqah), and that we should not have donkeys mount mares for breeding.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10596