Sahih Muslim Book 23, Hadith Number 5068.

Chapter : Permissibility of eating soup and merit of eating pumpkin.

Anas b. Malik reported that a person invited Allah’s Messenger (may peace be upon him) to a meal. I also went along with him. He brought soup containing pumpkin. Allah’s ‘messenger (may peace be upon him) ate that pumpkin with relish. He (Anas) said: When I saw that I began to place it before him, and did not eat it (myself). Anas said: It was since then that pumpkin was always my favourite (food).