Musnad Ahmad 32:1234

Rawh and ‘Abd al-Wahhab narrated to us, they said: Sa‘id narrated to us, from Qatadah, from Anas ibn Malik, that the Messenger of Allah (may Allah bless him and grant him peace) said: "If a sheep’s trotter were gifted to me, I would accept it. And if I were invited—‘Abd al-Wahhab said: to it, and Rawh said: to it—I would respond."