Showed him openly - Manifestly; so that there could be no deception, no doubt of his resurrection.

Him God raised up the third day - He lay long enough under the power of death to prove that he was dead; and not too long, lest it should be supposed that his disciples had time sufficient to have practiced some deceit or imposture; and, to prevent this, the Jews took care to have the tomb well guarded during the whole time which he lay there.

Him God raised up the third day,.... According to the Scriptures, particularly Hosea 6:2. The resurrection, of Christ, though it is sometimes ascribed to himself, as God, whereby he was declared to be the Son of God, yet generally to God the Father, as here:
and showed him openly; in a glorious body, and yet numerically the same he before lived and suffered in, so as to be heard, seen, and handled; by which full proof was given of the truth of his resurrection, in which he appeared to be the conqueror over death and the grave.

showed him openly; Not to all the people--for it was not fitting that He should subject Himself, in His risen condition, to a second rejection in Person.
but unto witnesses chosen before of God . . . to us, who did eat and drink with him after he rose, &c.--Not the less certain, therefore, was the fact of His resurrection, though withholding Himself from general gaze in His risen body.
he which was ordained of God to be the Judge of quick and dead--He had before proclaimed Him "Lord of all," for the dispensing of "peace" to all alike; now he announces Him in the same supreme lordship, for the exercise of judgment upon all alike. On this divine ordination, see John 5:22-23, John 5:27; Acts 17:31. Thus we have here all Gospel truth in brief. But, forgiveness through this exalted One is the closing note of Peter's beautifully simple discourse.