Ibn Ezra on Leviticus 10:12

קחו את המנחה. אחר שהקטירו ממנה לגבוה אין ראוי לאכול הנשאר כי אם מקודשים ועתה תחלו לאכול החוק שנתן לכם השם שתקחו תמיד מאשי ה׳‎ ופירושו כל מנחה שהקטירו ממנה לשם: TAKE THE MEAL-OFFERING. No one aside from those who are holy are fit to eat that which remains from the meal offering after part of it has been burned in honor of God.³²Hence Moses told Aaron and his sons to eat the meal offering. You shall begin to eat the portion which God has given you, to always take of God’s fire-offerings;³³I.E.’s interpretation of verse 13. this means³⁴The meaning of, of God’s fire-offerings all meal offerings, part of which was burned in honor of God.