וַיְהִ֞י בַּשָּׁנָ֤ה הַֽחֲמִישִׁית֙ לַמֶּ֣לֶךְ רְחַבְעָ֔ם עָלָ֛ה שִׁישַׁ֥ק מֶֽלֶךְ־מִצְרַ֖יִם עַל־יְרוּשָׁלִָ֑ם כִּ֥י מָעֲל֖וּ בַּיהוָֽה׃
And it came to pass in the fifth year of king Rehoboam, that Shishak king of Egypt came up against Jerusalem, because they had dealt treacherously with the LORD,
Read midrashic interpretation of II Chronicles 12:2: and classical rabbinic exegesis.