John Mark
Mark 14:66ESV·traditional attribution

And as Peter was below in the courtyard, one of the servant girls of the high priest came,

Matthew Henry Presbyterian

We have here the story of Peter's denying Christ. 1. It began in keeping at a distance from him. Peter had followed afar off (Mar 14:54), and now was beneath in the palace, at the lower end of the hall.

Commenting on Mark 14:66-72

John Gill Reformed Baptist

And he denied it again,.... That he was one of the disciples of Jesus: and a little after; about an hour after, Luk 22:59; they that stood by, said again to Peter, surely thou art one of them; one confidently affirmed that he was with Jesus, and another challenged him with seeing him in the garden with him, Luk 22:59, and in general they were...

William Burkitt Anglican

This last paragraph of the chapter gives us an account of the fall and rising of Peter; of his sin in denying Christ, and of his recovery by repentance. Both are considered distinctly in the notes of Matt 26:69. that which is here farther to be taken notice of, is as followeth. Observe, 1.