John Gill's Bible Commentary Ver. 6. But the children of the murderers he slew not , etc.] Which is an instance of his clemency and goodness, and of his strict regard to justice, and to the law of God; though he might fear, these, being spared, would one time or other revenge their fathers’ deaths; according to that which is written in the book of the law of Moses , (see Deuteronomy 24:16), wherein the Lord commanded, saying, the fathers shall not be put to death for the children, nor the children , etc. to which command Amaziah was obedient.
Matthew Henry Commentary
Verses 1-7 - Amaziah began well, but did not go on so. It is not enough to do tha which our pious predecessors did, merely to keep up the common usage but we must do it as they did, from the same principle of faith an devotion, and with the same sincerity and resolution.
Original Hebrew ואת853 בני1121 המכים5221 לא3808 המית4191 ככתוב3789 בספר5612 תורת8451 משׁה4872 אשׁר834 צוה6680 יהוה3068 לאמר559 לא3808 יומתו4191 אבות1 על5921 בנים1121 ובנים1121 לא3808 יומתו4191 על5921 אבות1 כי3588 אם518 אישׁ376 בחטאו2399 ימות׃4191