Deuteronomy 15:19

All the firstling males that come of thy herd, or of thy flock, thou shalt sanctify unto the Lord thy God,.... According to the law in Exodus 13:2.

Exodus 13:2;

Exodus 13:12;

Exodus 13:13;

thou shalt do no work with the firstling of thy bullock: as to plough or tread out the corn with it, which were done with other heifers:

nor shear the firstling of thy sheep; nor was the wool shorn of it to be made use of; one of the Jewish canons runs thus,

"if any man weave an hand's breadth of the wool of a firstling into cloth, the cloth is to be burnt l.''

l Misn. Orlah, c. 3. sect. 3.