TSK · Numbers 18:17

And he shall lay his hand upon the head of his offering, and kill it [at] the door of the tabernacle of the congregation: and Aaron's sons the priests shall sprinkle the blood upon the altar round about.

¶ All the firstling males that come of thy herd and of thy flock thou shalt sanctify unto the LORD thy God: thou shalt do no work with the firstling of thy bullock, nor shear the firstling of thy sheep.