Musnad Ahmad 1060:13

Haytham (meaning Ibn Kharijah) narrated to us, Ibn ‘Ayyash narrated to us, from Buhayr ibn Sa‘d, from Khalid ibn Ma‘dan, from al-Miqdam ibn Ma‘di Karib, from Abu Ayyub al-Ansari, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Measure your food, and it will be blessed for you."