But when they persecute you in this city, flee into another: for verily I say unto you, You shall not have gone over the cities of Israel, till the Son of man comes.
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Hilary of Poitiers
AD 368
He then tells them to flee out of one city into another. This means that his message would first go beyond the borders of Judea and pass into Greece. Then the messengers would be harassed and the various apostles would suffer among the cities of Greece. At last the message would be established among all the Gentiles. He also wished to indicate that the Gentiles would believe in the apostles’ preaching but that Israel alone would not believe until his own return. For this reason he said, “You will not have gone through all the towns of Israel before the Son of Man comes,” that is, after the conversion of all of the Gentiles. Israel will be left, and when he comes in splendor, it will fill out the number of the holy and be established in the church.