וּבִשְׁנַ֣ת עֶשְׂרִ֔ים לְיָרָבְעָ֖ם מֶ֣לֶךְ יִשְׂרָאֵ֑ל מָלַ֥ךְ אָסָ֖א מֶ֥לֶךְ יְהוּדָֽה׃
C’est dans la vingtième année du règne de Jéroboam sur Israël qu’Asa devint roi de Juda.
Rashi
Three years he reigned in Jerusalem and no more, as is proven in I Kings (15:9): “And in the twentieth year of Jeroboam, king of Israel, Asa reigned over Judah.” We find that he did not reign even three whole years.