Gevurot Meyruach Hakodesh 11:26

And, having found him, he brought him to Antioch. And it came about that for an entire year, they met with Moshiachʼs Kehillah there, and taught a large multitude. And it was in Antioch that the talmidim were first called Ma'aminim HaMeshichiyim (Messianic Believers).