Kings IV 14:6

6 But he slew not the sons of those that had slain him; according as it is written in the book of the laws of Moses, as the Lord gave commandment, saying, The fathers shall not be put to death for the children, and the children shall not be put to death for the fathers; but every one shall die for his own sins.

Kings IV 14:6 In-Context

4 Only he removed not the high places: as yet the people sacrificed and burnt incense on the high places.
5 And it came to pass when the kingdom was established in his hand, that he slew his servants that had slain the king his father.
6 But he slew not the sons of those that had slain him; according as it is written in the book of the laws of Moses, as the Lord gave commandment, saying, The fathers shall not be put to death for the children, and the children shall not be put to death for the fathers; but every one shall die for his own sins.
7 He smote of Edom ten thousand in the valley of salt, and took the Rock in the war, and called its name Jethoel until this day.
8 Then Amessias sent messengers to Joas son of Joachaz son of Ju king of Israel, saying, Come, let us look one another in the face.

Footnotes 1

The Brenton translation of the Septuagint is in the public domain.