Mukhtasar Bukhari

Abu Musa (may Allah be pleased with him) says that when a petitioner would come to the Messenger of Allah (peace and blessings of Allah be upon him) or something would be asked from him, he (peace be upon him) would say: "Intercede (recommend) for him (to help him), and you will be rewarded for it, and Allah causes what He wills to be decreed through the tongue of His Prophet."