Bridgeway Bible Commentary - Deuteronomy 21:1-23
Respect for human life (21:1-23)Murder made the land unclean, and the uncleanness could be removed only by the execution of the murderer (see Numbers 35:29-34). Where the murderer could not be found, the elders of the town nearest the place of the murder had to go to an unpolluted stream nearby and carry out the ritual slaughter of a young cow instead of the unknown murderer. The blood of the cow washed away in the stream symbolized the removal of uncleanness caused by the unlawful bloodshed... read more
Albert Barnes' Notes on the Whole Bible - Deuteronomy 21:15-17
Moses did not originate the rights of primogeniture (compare Genesis 25:31), but recognized them, since he found them pre-existing in the general social system of the East. Paternal authority could set aside these rights on just grounds Genesis 27:33, but it is forbidden here to do so from mere partiality. read more