Salman said he read in the Torah that the blessing of food consists in ablution after it, and when he mentioned that to the Prophet he said, “The blessing of food consists in ablution before it and ablution after it.”
Abu Ayyub told that when God’s messenger ate or drank he said, “Praise be to God who has given food and drink, made it easy to swallow, and provided an exit for it.”
Ibn ‘Abbas told that when food was presented to the Prophet or, his coming out from the privy and he was asked whether they should bring him water for ablution, he replied, “I have been commanded to perform ablution only when I get up for prayer.”
Tirmidhi, Abu Dawud and Nasa’i transmitted it, and Ibn Majah transmitted it on Abu Huraira’s authority.