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 Exo 13:2. See Gill on Exo 13:2; See Gill on Exo 13:12; See Gill on Exo 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.