ναί,
particle of affirmation,
yea, verily, even so; in answer to a question: Mt 9:2813:5117:2521:16, Jo 11:2721:15, 16, Ac 5:822:27, Ro 3:29; seq. λέγω ὑμῖν, Mt 11:9, Lk 7:26; repeated for emphasis, ναὶ ναί (opp. to οὒοὔ): Mt 5:37; ἤτω ὑμῶν τὸ ναὶ ναί, Ja 5:12; ν. καὶ οὔ, II Co 1:18, 19; ἵνα ᾖ... τὸ ναὶ ναί, II Co 1:17; τὸ ν., II Co 1:20; in assent to an assertion: Mt 15:27, Mk 7:28, Re 14:1316:7; in confirmation of a previous assertion: Mt 11:26, Lk 10:2111:5112:5, Phl 4:3, Phm 20; in solemn asseveration: Re 1:722:20.†