We must wholly drop all thoughts of David king of Israel in this precious portion of the Psalm; for of none could the Holy Ghost speak in language like this, but of Jesus, who is Jehovah's King in Zion before God forever. Here we behold him, concerning whom the angel spake, when announcing his incarnation, the Lord God shall give unto him the throne of his father David; and he shall reign over the house of Jacob forever, and of his kingdom there shall be no end. Luke 1:32-33. Hail! thou almighty King of kings, and Lord of lords! Oh! may the knee of my heart be always bent before thee. Philippians 2:10-11.
Related Commentaries of Psalms 61:6
Psalms 61:6-8
6 Thou wilt prolong the king's life: and his years as many generations.
7 He shall abide before God for ever: O prepare mercy and truth, which may preserve him.
8 So will I sing praise unto thy name for ever, that I may daily perform my vows.