It seems agreed that κερδαίνω in the sense of ‘to win over an unbeliever to one's faith’ (I Cor. 9.19–22, I Pet. 3.1) or ‘to win back a sinner to the way of life required by his and your faith’ (Matt. 18.15) is an echter terminus technicus der Missions-sprache; by which is meant, apparently, that there is no precedent for this sense of the word in either Hellenistic or Rabbinic language. I wish to suggest that this view is not correct; and that the use of κερδαίνω in the passages in question, while conceivably reflecting a specifically Christian trend, is in the main determined by the Rabbinic vocabulary.
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