This is the stone which was set at nought of you builders, which is become the head of the corner.

People's New Testament

4:11 This is the stone which was set at nought. Quoted from Ps 118:22. A figure drawn from a building where a rejected, despised stone is the most important and indispensable stone of the structure. Christ quoted the same passage, applied to himself (Mt 21:42).

Wesley's Notes

4:11 Psalm 118:22.

Jamieson-Fausset-Brown Bible Commentary

11. This is the stone which was set at naught of you builders, &c.-This application of Ps 118:22, already made by our Lord Himself before some of the same "builders" (Mt 21:42), is here repeated with peculiar propriety after the deed of rejection had been consummated, and the rejected One had, by His exaltation to the right hand of the Majesty on high, become "the head of the corner."

Matthew Henry's Concise Commentary

4:5-14 Peter being filled with the Holy Ghost, would have all to understand, that the miracle had been wrought by the name, or power, of Jesus of Nazareth, the Messiah, whom they had crucified; and this confirmed their testimony to his resurrection from the dead, which proved him to be the Messiah. These rulers must either be saved by that Jesus whom they had crucified, or they must perish for ever. The name of Jesus is given to men of every age and nation, as that whereby alone believers are saved from the wrath to come. But when covetousness, pride, or any corrupt passion, rules within, men shut their eyes, and close their hearts, in enmity against the light; considering all as ignorant and unlearned, who desire to know nothing in comparison with Christ crucified. And the followers of Christ should act so that all who converse with them, may take knowledge that they have been with Jesus. That makes them holy, heavenly, spiritual, and cheerful, and raises them above this world.