They only heard (monon akouonte hsan). Periphrastic imperfect, "They were only hearing from time to time." That once persecuted us (o diwkwn hma pote). Present active articular participle, a sort of participle of antecedent time suggested by pote, "the one who used to persecute us once upon a time." The faith (thn pistin). Here used in the sense of "the gospel" as in Acts 6:7 .