
τοῖς ὑπὸ νόμον ὡς ὑπὸ νόμον, μὴ ὢν αὐτὸς ὑπὸ νόμον, ἵνα τοὺς ὑπὸ νόμον κερδήσωByz along with D2 (L) Ψ 1881 and the Peshitta (per NA27) don’t have the phrase μὴ ὢν αὐτὸς ὑπὸ νόμον. It’s a case of parablepsis and so another place where the Byzantine text unexpectedly preserves a shorter, secondary reading.
To those under the law I became as one under the law (not that I was myself under the law) in order that I might gain those under the law.