Musnad Ahmad 1153:171

Abu Mu'awiyah narrated to us, Al-A'mash narrated to us, from Muslim, from Masruq, from Aisha, who said: The Messenger of Allah (peace and blessings of Allah be upon him) granted a concession regarding a matter, but some people abstained from it. That reached the Prophet (peace and blessings of Allah be upon him), so he became angry until the anger was visible on his face. Then he said: "What is the matter with people who turn away from that which I have been granted a concession in? By Allah, I am the most knowledgeable of them regarding Allah, the Mighty and Majestic, and the most intense of them in fear of Him."