Abu 'Ubayd Radiyallahu 'Anhu says:
"I cooked a pot (food) for Rasulullah Sallallahu 'Alayhi Wasallam. Because Rasulullah Sallallahu 'Alayhi Wasallam loved the dhiraa (forequarter of a goat or sheep) a lot, I served him that portion. He then ordered another one, I served the ,second one. He then ordered one again. I replied: 'Ya Rasulullah (Sallallahu 'Alayhi Wasallam) the goat has only two dhiraa'. Rasulullah Sallallahu 'Alayhi Wasallam then said: 'I swear an oath by the Name of that Being in whose hands is my life, if you kept quiet, you could have served me every time I requested one'".
English reference: Book 25, Hadith 160
Arabic reference: Book 26, Hadith 169