Exodus 12:8; Exodus 34:25; Leviticus 2:11

They shall eat the flesh that night, roasted on the fire; with kunleavened bread and bitter herbs they shall eat it.

25 nYou shall not offer the blood of my sacrifice with anything leavened, oor let the sacrifice of the Feast of the Passover remain until the morning.

11 No grain offering that you bring to the Lord shall be made with aleaven, for you shall burn no leaven nor any honey as a food offering to the Lord.