He saith, Yes. — Peter’s answer was ready enough. There was no need for him to inquire further. His Master would pay it now as He had paid it before (this is clearly implied), as every devout Israelite would pay. Both the application and the answer suggest the thought that our Lord was looked upon as domiciled in the house of Peter. The answer, however, was given without thought of the altered conditions of the case. He had not yet learnt to grasp the full meaning of the truth which he had himself so recently confessed.
Jesus prevented him. — Literally, anticipated, The word is nowhere else used of our Lord’s teaching. Its significance is explained by what follows. Peter and the other disciples were about to come to Him with a question of a very different kind (Matthew 18:1), rising out of their mutual rivalries, and therefore, before that question could be asked, He anticipated the eager disciple that He might lead him on one step further into the mysteries of the kingdom.
Take custom or tribute. — The first word points to the duties on the export or import of goods, the octroi, in modern language, levied on provisions as they were brought in or out of towns; the second, as stated above, to the poll-tax paid into the Roman treasury, which followed on the taxing or registration of Luke 2:2; Acts 5:37. Both were probably farmed by the capitalist publicani, and collected by the “publicans” of the Gospels, or other inferior officers.
Of their own children, or of strangers? — The first word can hardly be taken of merely natural relationship. The “children of the kingdom” (Matthew 13:38) are not the king’s sons, but his home-born, free subjects. The “strangers” were the aliens, the men of another race, who owned his sovereignty.