Charles Ellicott Commentary 2 Chronicles 12:5

"Now Shemaiah the prophet came to Rehoboam, and to the princes of Judah, that were gathered together to Jerusalem because of Shishak, and said unto them, Thus saith Jehovah, Ye have forsaken me, therefore have I also left you in the hand of Shishak." — 2 Chronicles 12:5 (ASV)

Then. — And.

Shemaiah the prophet. —The section relating to his mission and its results (2 Chronicles 12:5–8) is unique to the chronicle.

The princes of Judah, who were gathered together to Jerusalem. —Repulsed by the Egyptian arms, they had fallen back upon Jerusalem, to defend the capital. While the invading army lay before the city, Shemaiah addressed the king and princes.

You have forsaken. —There is emphasis on the pronoun. Literally, You have forsaken me, and I also have forsaken you, in (into) the hand of Shishak. The phrase “to leave into the hand” of a foe occurs Nehemiah 9:28. (Compare also 2 Chronicles 15:2; 2 Chronicles 24:20; and Deuteronomy 31:16-17.) Here the words amount to a menace of utter destruction. (Compare Jonah 3:4.)