John Mark
Mark 14:69KJV·traditional attribution
And a maid saw him again, and began to say to them that stood by, This is one of them.
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
Geneva Bible Notes Reformed
And a maid saw him again, and began to say to them that stood by, This is [one] of them. (q) If we carefully compare the evangelists together we will perceive that Peter was known by many through the maiden's report: furthermore, when the second denial is spoken of in Luke, there is a man servant mentioned and not a maid.