וּבִשְׁנַת֙ שְׁמֹנֶ֣ה עֶשְׂרֵ֔ה לַמֶּ֖לֶךְ יָרָבְעָ֣ם בֶּן־נְבָ֑ט מָלַ֥ךְ אֲבִיָּ֖ם עַל־יְהוּדָֽה׃
Now in the eighteenth year of king Jeroboam the son of Nebat began Abijam to reign over Judah.
Read midrashic interpretation of I Kings 15:1: and classical rabbinic exegesis.