Exodus 34:25 in the King James Version
Thou shalt not offer the blood of my sacrifice with leaven; neither shall the sacrifice of the feast of the passover be left unto the morning.
Context
24 For I will drive out nations before you and enlarge your borders; neither shall any man desire your land when you go up to appear before the LORD, your God, three times in the year.
25 “You shall not offer the blood of my sacrifice with leavened bread. The sacrifice of the feast of the Passover shall not be left to the morning.
26 “You shall bring the first of the first fruits of your ground to the house of the LORD your God. “You shall not boil a young goat in its mother’s milk.”