Exodus 23:18 in the World English Bible
“You shall not offer the blood of my sacrifice with leavened bread. The fat of my feast shall not remain all night until the morning.
Context
17 Three times in the year all thy males shall appear before the Lord GOD.
18 Thou shalt not offer the blood of my sacrifice with leavened bread; neither shall the fat of my sacrifice remain until the morning.
19 The first of the firstfruits of thy land thou shalt bring into the house of the LORD thy God. Thou shalt not seethe a kid in his mother’s milk.