Have erred (ēstochēsan). “Missed the mark.” First aorist active indicative of astocheō, for which see note on 1Ti 1:6; 1Ti 6:21.
That the resurrection is past already (anastasin ēdē gegonenai). Second perfect active infinitive of ginomai in indirect assertion after legontes (saying) with the accusative of general reference (anastasin).