TSK
Treasury of Scripture Knowledge references in WEB.
the day that you stood before Yahweh your God in Horeb, when Yahweh said to me, "Assemble me the people, and I will make them hear my words, that they may learn to fear me all the days that they live on the earth, and that they may teach their children."
and there you shall bring your burnt offerings, and your sacrifices, and your tithes, and the wave offering of your hand, and your vows, and your freewill offerings, and the firstborn of your herd and of your flock:
but in the place which Yahweh shall choose in one of your tribes, there you shall offer your burnt offerings, and there you shall do all that I command you.
All the firstborn males that are born of your herd and of your flock you shall sanctify to Yahweh your God: you shall do no work with the firstborn of your herd, nor shear the firstborn of your flock.