God save the king - May the king live! See on 2 Kings 11:12 (note).

The coronation of Joash, as in 2 Kings 11:12. The subject of ויּוציאוּ and ויּתּנוּ is those present, while in ויּוציא and ויּתּן (Kings), Jehoiada as leader of the whole is referred to. In the Chronicle, Jehoiada and his sons, i.e., the high priest with the priests assisting him, are expressly named as subject to ימליכוּ and ויּמשׁצהוּ, where in Kings also the plural is used; while, on the contrary, "the clapping of the hands" as a sign of joyful acclamation (Kings) is omitted, as being unimportant.

Then they brought out the king's son, and put upon him the crown, and gave him the {g} testimony, and made him king. And Jehoiada and his sons anointed him, and said, God save the king.

(g) That is, the book of the law or as some read they put on him his royal apparel.

23:11 His sons - And Zechariah among the rest, whom afterwards he ungratefully slew, chap.24:21.

God...: Heb. Let the king live

11. Then they brought out the king's son, and put upon him the crown, and gave him the testimony-Some think that the original word rendered "testimony," as its derivation warrants, may signify here the regalia, especially the bracelet (2Sa 1:10); and this view they support on the ground that "gave him" being supplemented, the text properly runs thus, "put upon him the crown and testimony." At the same time, it seems equally pertinent to take "the testimony" in the usual acceptation of that term; and, accordingly, many are of opinion that a roll containing a copy of the law (De 17:18) was placed in the king's hands, which he held as a scepter or truncheon. Others, referring to a custom of Oriental people, who when receiving a letter or document from a highly respected quarter, lift it up to their heads before opening it, consider that Joash, besides the crown, had the book of the law laid upon his head (see Job 31:35, 36).

God save the king-literally, "Long live the king."

23:12-20 A warning from God was sent to Jehoram. The Spirit of prophecy might direct Elijah to prepare this writing in the foresight of Jehoram's crimes. He is plainly told that his sin should certainly ruin him. But no marvel that sinners are not frightened from sin, and to repentance, by the threatenings of misery in another world, when the certainty of misery in this world, the sinking of their estates, and the ruin of their health, will not restrain them from vicious courses. See Jehoram here stripped of all his comforts. Thus God plainly showed that the controversy was with him, and his house. He had slain all his brethren to strengthen himself; now, all his sons are slain but one. David's house must not be wholly destroyed, like those of Israel's kings, because a blessing was in it; that of the Messiah. Good men may be afflicted with diseases; but to them they are fatherly chastisements, and by the support of Divine consolations the soul may dwell at ease, even when the body lies in pain. To be sick and poor, sick and solitary, but especially to be sick and in sin, sick and under the curse of God, sick and without grace to bear it, is a most deplorable case. Wickedness and profaneness make men despicable, even in the eyes of those who have but little religion.