All tongues are for the sake of unbelievers [1 Cor. 14:22]. In other words, that gift has no purpose in the church when everyone present is a believer. And once the sign served its purpose to pronounce judgment or cursing on Israel, and the judgment fell, the purpose ceased along with the sign gift. The blessing of that sign was that God would build a new nation of Jews and Gentiles to be His people (Gal. 3:28), to make Israel jealous and someday repent (Rom. 11:11, 12, 25-27). The sign was thus repeated when Gentiles were included in the church (Ac. 10:44-46).