John Gill Commentary Deuteronomy 15:19

"All the firstling males that are born of thy herd and of thy flock thou shalt sanctify unto Jehovah thy God: thou shalt do no work with the firstling of thy herd, nor shear the firstling of thy flock." — Deuteronomy 15:19 (ASV)

All the firstling males that come of your herd, or of your
flock, you shall sanctify unto the Lord your God
According to the law in (Exodus 13:2Exodus 13:12Exodus 13:13) . (See Gill on Exodus 13:2); (See Gill on Exodus 13:12); (See Gill on Exodus 13:13);

you shall do no work with the firstling of your bullock :
as to plough or tread out the corn with it, which were done with other heifers:

nor shear the firstling of your 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 ^F12 .''

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FOOTNOTES:

• F12: Misn. Orlah, c. 3. sect. 3.