Early Church Fathers
1 Lightfoot adopts Laurents' emendation and reads n/to. Siga/to has also been suggested and Hort's thinks sth/tw to be the genuine reading. It all comes to the same thing, however, the meaning being perfectly clear.
1 Most interesting literature on the whole eubject will be found in conoexion with the frescoes and cups, etc., found in the catacombs.