μέλλω,

[in LXX: Job.3:8 (עָתִיד) 19:25 (אַחֲרוֹן); elsewhere for fut. and frequently in Wi, II, 4Mac ;]

to be about to be or do;

__1. with inf. (Bl. §62, 4; 68, 2; M, Pr. 114);

__(a) of intending or being about to do of one's own free will: with inf. praes. Mat.2:13, Luk.10:1, Act.3:3 5:35, Heb.8:5, 2Pe.1:12 (Field, Notes, 240), al.; with inf. aor. (Bl. §58, 3), Act.12:6, Rev.3:16;

__(b) of compulsion, necessity or certainty: with inf. praes. Mat.16:27, Luk.9:31, Jhn.6:71, Rom.4:24, al.; with inf. aor. Rom.8:18, Gal.3:23, Rev.3:2 12:4.

__2. Ptcp. ὁ μέλλων: absol. Rom.8:38, 1Co.3:22; τὰ μ. Col.2:17; εἰς τὸ μ. (Field, Notes, 65); with subst. Mat.3:7 12:32 (ὁ αἰὼν ὁ μ.; LXX for עַד), Act.24:25, 1Ti.4:8, Heb.2:5, al.

(AS)

to be about