Abu Sa'eed Khudari Radiyallahu 'Anhu says:
"After eating Rasulullah Sallallahu 'Alayhi Wasallam read this du'aa:Alhamdulillaahil-ladhi at-amanaa wa-saqaa-naa wa-ja-a-lanaa muslimeen. (ES)
English reference (ES): Book 27, Hadith 182 (ES)
Arabic reference (ES): Book 28, Hadith 191 (ES)