Exodus 12:3, 5-6

Announce to the whole community of Israel that on the tenth day of this month each family must choose a lamb or a young goat for a sacrifice, one animal for each household.

The animal you select must be a one-year-old male, either a sheep or a goat, with no defects. “Take special care of this chosen animal until the evening of the fourteenth day of this first month. Then the whole assembly of the community of Israel must slaughter their lamb or young goat at twilight.