For David speaketh concerning him. — More accurately, in reference to Him — i.e., in words which extended to Him. Reading Psalms 16 without this interpretation, it seems as if it spoke only of the confidence of the writer that he would be himself delivered from the grave and death. Some interpreters confine that confidence to a temporal deliverance; some extend it to the thought of immortality, or even of a resurrection. But Peter had been taught, both by his Lord and by the Spirit, that all such hopes extend beyond themselves — that the ideal of victory after suffering, no less than that of the righteous sufferer, was realised in Christ. The fact of the Resurrection had given a new meaning to prophecies which would not, of themselves, have suggested it, but which were incomplete without it.
He is on my right hand. — The Psalmist thought of the Eternal as the warrior thinks of him who, in the conflict of battle, extends his shield over the comrade who is on the left hand, and so guards him from attack. When the Son of Man is said to sit on the right hand of God (Psalms 110:1; Matthew 26:64) the imagery is different, and brings before us the picture of a king seated on his throne with his heir sitting in the place of honour by his side.