The verbal form κατέλθῇ, which appears in the passage of Adv. Haer. 1, 13, 3, linn. 56-58, in which Irenaeus presents the Marcosian doctrine, is usually translated as to descend, following the old Latin version. However, in another place in the work of Irenaeus himself, this verb receives other translations. This note shows how it may be much better to translate the verb κατέρχομαι in AH 1, 13, 3, linn. 56-58 by devenire, redere.