Charles Ellicott Commentary 2 Chronicles 6:12

"And he stood before the altar of Jehovah in the presence of all the assembly of Israel, and spread forth his hands" — 2 Chronicles 6:12 (ASV)

3. THE KING UTTERS THE PRAYER OF CONSECRATION (2 Chronicles 6:12–42).
(Compare to 1 Kings 8:22–53.)

The whole is given as in Kings, except that one verse (2 Chronicles 6:13) is added, and the concluding part (2 Chronicles 6:40–42) is quite different.

Stood. — Took his place. It is not implied that he remained standing. (Compare to 1 Samuel 17:51; 2 Chronicles 6:3, above.)

Spread out his hands. — Towards heaven (Kings). Syriac and Arabic have both.