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They were fishermen, tax collector, etc. They worked for a living. They didn't spend their days studying the scrolls under learned rabbis like the pharisees did. But they obviously knew enough for Jesus to work with.
Now when they saw the boldness of Peter and John, and perceived that they were unlearned and ignorant men, they marvelled; and they took knowledge of them, that they had been with Jesus. Acts 4:13