en_tn/2ch/36/09.md

eight years old ... three months and ten days

"8 years old ... 3 months and 10 days" (See: rc://en/ta/man/jit/translate-numbers)

what was evil in the sight of Yahweh

Here "sight" here represents judgment. Yahweh saw and did not approve of Jehoiachin's actions. Alternate translation: "what Yahweh judged to be evil" or "what Yahweh considered to be evil" (See: rc://en/ta/man/jit/figs-metaphor)