εἰ μὴ ἦλθον καὶ ἐλάλησα αὐτοῖς, ἁμαρτίαν οὐκ εἶχον → if I had not come and spoken to them, they would not be guilty of sin
interdŭātim: adv., an old form for interdum,
I sometimes, now and then, acc. to Paul. ex Fest. p. 111 Müll. (but the true reading is interdum, Plaut. Truc. 4, 4, 29).