Contradiction with Exodus 20:5
This verse describes God as visiting the iniquity of the fathers upon the children, which contradicts the plea for mercy on Jonathan’s descendants in 1 Samuel 20:15.
Exodus 20:5: Thou shalt not bow down thyself to them, nor serve them: for I the LORD thy God [am] a jealous God, visiting the iniquity of the fathers upon the children unto the third and fourth [generation] of them that hate me;
Contradiction with Deuteronomy 24:16
This verse states that children shall not be put to death for their fathers, contrary to 1 Samuel 20:15's implication of ongoing mercy or judgment affecting future generations.
Deuteronomy 24:16: The fathers shall not be put to death for the children, neither shall the children be put to death for the fathers: every man shall be put to death for his own sin.
Contradiction with Ezekiel 18:20
Ezekiel claims the son will not bear the iniquity of the father, which contradicts the ancestral mercy mentioned in 1 Samuel 20:15.
Ezekiel 18:20: The soul that sinneth, it shall die. The son shall not bear the iniquity of the father, neither shall the father bear the iniquity of the son: the righteousness of the righteous shall be upon him, and the wickedness of the wicked shall be upon him.
Contradiction with Jeremiah 31:30
It asserts that every individual will die for their own sin, unlike the concept of mercy extended to Jonathan's descendants in 1 Samuel 20:15.
Jeremiah 31:30: But every one shall die for his own iniquity: every man that eateth the sour grape, his teeth shall be set on edge.