The pattern of sound words (υποτυπωσιν υγιαινοντων λογων). See 1. Timothy 1:16 for υποτυπωσιν and 1. Timothy 1:10 for υγιαινω.

Which (ων). Genitive plural with ηκουσας (didst hear) or attracted to case of λογων (ακουω is used either with the accusative or the genitive).