Charles Ellicott Commentary Deuteronomy 17:1

"Thou shalt not sacrifice unto Jehovah thy God an ox, or a sheep, wherein is a blemish, [or] anything evil; for that is an abomination unto Jehovah thy God." — Deuteronomy 17:1 (ASV)

Thou shalt not sacrifice ... —The law concerning the purity of victims is given in full in Leviticus 22:17-25. It takes its place there among the special laws of holiness.

The same principle appears to unite the several topics treated here in Deuteronomy, such as the holy days, the administration of justice, and the absence of groves and images, with a precept like this regarding the perfection of sacrifices.

The holiness of the God of Israel necessitates them all. Truth, justice, and purity are demanded in all that come near Him. The dignity of His Kingdom is also concerned here. (See Introduction.)

Sheep. —The Hebrew word is sêh (on which see Deuteronomy 14:4, note). It may be either a lamb or a kid.

The only time in history when the sacrifice of imperfect creatures is complained of to any great extent is the time of the prophet Malachi . The laxity of the priests in his time called forth the prophecy that in every place incense should be offered to God’s name and a pure offering.