He appointed the twelve: Simon (to whom he gave the name Peter);
Mark 3:16. And to Simon he gave the name Peter. Though all Christians must be living stones This alludes to the Greek word Πέτρος, (Peter,) which literally signifies a stone. We shall afterwards find (Matthew 16:18) that our Lord makes express reference to the meaning of the name. — Ed.
In these verses, we have, I. The choice Christ made of the twelve apostles to be his constant followers and attendants, and to be sent abroad as there was occasion, to preach the gospel. Observe, 1. The introduction to this call or promotion of disciples; He goes up into a mountain, and his errand thither was to pray.
Commenting on Mark 3:13-21
And Simon he surnamed Peter. Or Cephas, which signifies a rock, or stone, because of his courage and constancy, his strength and fortitude, steadiness and firmness of mind: this name was imposed upon him, not at the time of his mission as an apostle; nor when he made that noble confession of his faith in Christ, as the Son of the living God, at which...