Acts 2:41

41Thoseοἱindeedμὲνthereforeοὖνhaving receivedἀποδεξάμενοιtheτὸνwordλόγονof himαὐτοῦwere baptizedἐβαπτίσθησαν,andκαὶwere addedπροσετέθησανonἐνtheτῇdayἡμέρᾳthatἐκείνῃsoulsψυχαὶaboutὡσεὶthree thousandτρισχίλιαι.

Therefore those indeed having received his word were baptized, and on that day about three thousand souls were added.