It is narrated from Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him); he said: Whenever the Messenger of Allah (peace and blessings be upon him) ate or drank something, he would say: "Al-hamdu lillahil-ladhi at'ama wa saqa wa sawwaghahu wa ja'ala lahu makhraja (All praise is for Allah, who fed, gave drink, made it pleasant to swallow, and made for it a way out)."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4067