פּירוש אויף תהילים 110:7

From the stream on the way he would drink, etc. From the Nile River, on the way of its course, his land would drink, and it was not in need of rain water. Therefore, he would raise his head and boast (Ezek. 29:3): “My river is my own, and I made myself.” In another manner, this psalm can be explained regarding David:

[1] The word of the Lord about my master Concerning my master, Saul, when I was pursued by him.

about my master Heb. לאדני, about my master, as (Exod. 14:3): “Then Pharaoh will say concerning the children of (לבני) Israel”; (Gen. 26:7), “The people of the place asked him about his wife (לאשתו).”

“Wait for My right hand” Stay and wait for My salvation.

[2] The staff of your might the Lord will send from Zion The exceptional good deeds in your hand. Another explanation: You will yet reign in Zion, and there a staff of might will be sent to you, and then you will rule in the midst of your enemies.

[3] Your people will volunteer on the day of your host The people of Israel will volunteer to your aid on the day that you form an army, as it is delineated in (I) Chronicles (12:21); that they were joining him from every tribe: “When he went to Ziklag, there deserted to him of Manasseh, etc.”; (ibid. verse 8): “And from the Gadites there separated themselves to David, etc.”

because of the beauty of holiness when you fell from the womb Because of the beauty of holiness that was in you from your youth.

your youth is like dew A good youth and a good period of maturity that you had will be to you like dew, which is pleasant and sweet, and will produce fruit for you to make you prosper.

[4] The Lord has sworn, etc. that the kingdom will be yours forever.

You are a priest forever And which of the priesthoods? A priesthood that is above the priesthood of Malchizedek, and that is the kingdom, which is above the high priesthood in thirty steps.