A.T. Robertson Commentary Matthew 16:13

"Now when Jesus came into the parts of Caesarea Philippi, he asked his disciples, saying, Who do men say that the Son of man is?" — Matthew 16:13 (ASV)

Caesarea Philippi (Καισαριας της Φιλιππου). Up on a spur of Mt. Hermon under the rule of Herod Philip.

He asked (ηρωτα). Began to question, inchoative imperfect tense. He was giving them a test or examination. The first was for the opinion of men about the Son of Man.