However, he did not kill the children of the assassins, for he obeyed the command of the Lord as written by Moses in the Book of the Law: “Parents must not be put to death for the sins of their children, nor children for the sins of their parents. Those deserving to die must be put to death for their own crimes.”
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The children of the murderers he did not kill - This seems to be noted as a rare instance of clemency (compare the note on [Reference 2 King…

Even with the kings of Israel. — Probably some words have fallen out, and the original text was: “and was buried in Samaria

But the children of the murderers he slew not Which is an instance of his clemency and goodness, and of his strict regard…

Amaziah began well, but did not continue as he had begun. It is not enough to do what our pious predecessors did, merely to keep up the common usag…
Albert Barnes
AlbertBarnes