Contradiction with Leviticus 27:26
Leviticus states that the firstborn of animals, which are already the Lord's, should not be sanctified or devoted through a vow, as they inherently belong to God, contrasting the deference in treatment shown in Deuteronomy 15:19 to firstborn animals.
Leviticus 27:26: Only the firstling of the beasts, which should be the LORD'S firstling, no man shall sanctify it; whether [it be] ox, or sheep: it [is] the LORD'S. [firstling of: Heb. firstborn, etc]
Contradiction with Exodus 34:19-20
Exodus 34 speaks of redeeming the firstborn of animals and humans, whereas Deuteronomy 15:19 specifically highlights not working or shearing the firstborn of cattle and sheep, reflecting a focus on dedicating them without redemption.
Exodus 34:19-20: All that openeth the matrix [is] mine; and every firstling among thy cattle, [whether] ox or sheep, [that is male]. [sheep: or, kid]
Contradiction with Numbers 18:17
Numbers 18 talks about not redeeming the firstborn of animals because they are to be sacrificed, which could suggest a different form of dedication compared to the restrictions on working and shearing in Deuteronomy 15:19.
Numbers 18:17: But the firstling of a cow, or the firstling of a sheep, or the firstling of a goat, thou shalt not redeem; they [are] holy: thou shalt sprinkle their blood upon the altar, and shalt burn their fat [for] an offering made by fire, for a sweet savour unto the LORD.
Paradox #1
The contradiction might arise from the practice of animal sacrifice, which could conflict with contemporary views on animal rights and welfare. Some people today might find it inconsistent to have religious directives that involve sacrificing animals, considering modern ethical perspectives that emphasize kindness and compassion towards all living beings.