Verse 7. God hath spoken in his holiness. Aforetime the Lord had made large promises to David, and these his holiness had guaranteed. The divine attributes were pledged to give the son of Jesse great blessings; there was no fear that the covenant God would run back from his plighted word.
I will rejoice. If God has spoken we may well be glad: the very fact of a divine revelation is a joy. If the Lord had meant to destroy us he would not have spoken to us as he has done. But what God has spoken is a still further reason for gladness, for he has declared "the sure mercies of David", and promised to establish his seed upon his throne, and to subdue all his enemies. David greatly rejoiced after the Lord had spoken to him by the mouth of Nathan. He sat before the Lord in a wonder of joy. See 1 Chronicles 17:1-27 , and note that in the next chapter David began to act vigorously against his enemies, even as in this Psalm he vows to do.
I will divide Shechem. Home conquests come first. Foes must be dislodged from Israel's territory, and lands properly settled and managed.
And mete out the valley of Succoth. On the other side Jordan as well as on this the land must be put in order, and secured against all wandering marauders. Some rejoicing leads to inaction, but not that which is grounded upon a lively faith in the promise of God. See how David prays, as if he had the blessing already, and could share it among his men: this comes of having sung so heartily unto the Lord his helper. See how he resolves on action, like a man whose prayers are only a part of his life, and vital portions of his action.
EXPLANATORY NOTES AND QUAINT SAYINGS
Verse 7. God hath spoken the word of assurance. This refers to all the words in which the land of their inheritance was defined, especially Genesis 15:18 Exodus 23:31 Deuteronomy 11:24 , and that remarkable prediction concerning the perpetuity of David's line, 2 Samuel 7:1-17 , which must have made a deep impression on his mind. From these passages it is evident that Aram as well as Edom was included in the full compass of the territory designed for Israel, and that David felt himself to be in the path of destiny when he was endeavouring to extend his sway from the river of Egypt to the great river, even the Euphrates. In his holiness, in the immutable integrity of his heart, which was an infallible guarantee for the fulfilment of his promise. I will exult. This is the exclamation of the representative head of the people, when he ponders upon the divine utterance. --James G. Murphy.
Verse 7. Faith closing with a promise, will furnish joy to the believer before he enjoys the performance of it: God hath spoken, saith he, I will rejoice. --David Dickson.
Verse 7. He, the second David, had accomplished his warfare, and had crowned himself with victory. Henceforth he would apportion the kingdoms of the world and subdue them unto himself at his own holy will. Ephraim and Judah, Moab and Philistia, the Jew first and then the Gentile, were to be brought to confess him as their Lord. --Plain Commentary.
HINTS FOR PASTORS AND LAYPERSONS
Verse 7. God's voice the cause of joy, the reason for action, the guarantee of success.