Musnad Ahmad 462:20

Al-Hakam ibn Nafi' narrated to us, he said: Isma'il ibn 'Ayyash narrated to us, from Buhayr ibn Sa'd, from Khalid ibn Ma'dan, from al-Miqdam ibn Ma'di Karib, that he saw the Prophet, peace and blessings of Allah be upon him, spreading his hands, saying: "No one among you has eaten food in this world better for him than that he eats from the work of his own hands."