Leviticus 3:2

3:2 He must lay his hand on the head of his offering and slaughter it at the entrance of the Meeting Tent, and the sons of Aaron, the priests, must splash the blood against the altar’s sides.

Leviticus 27:8

27:8 If he is too poor to pay the conversion value, he must stand the person before the priest and the priest will establish his conversion value; according to what the man who made the vow can afford, the priest will establish his conversion value.