Gevurot 20:2-3

2 And having traveled through those regions and having exhorted the Moshiach’s talmidim there with many words, Rav Sha’ul came to Greece.
3 And after he had spent shloshah chodashim there, Rav Sha’ul was about to set sail for Syria when a kesher (conspiracy) was plotted against him by the [unbelieving] Yehudim, and so Rav Sha’ul decided to return through Macedonia.
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