Matthew 2:13μέλλει
When the Magi had gone, an angel of the Lord appeared to Joseph in a dream. “Get up!” he said. “Take the Child and His mother and flee to Egypt. Stay there until I tell you, for Herod is going to search for the Child to kill Him.”
Luke 19:11μέλλει
While the people were listening to this, Jesus proceeded to tell them a parable, because He was near Jerusalem and they thought the kingdom of God would appear imminently.
John 7:35μέλλει
At this, the Jews said to one another, “Where does He intend to go that we will not find Him? Will He go where the Jews are dispersed among the Greeks, and teach the Greeks?
Acts 3:3μέλλοντας
When he saw Peter and John about to enter, he asked them for money.
Hebrews 1:14μέλλοντας
Are not the angels ministering spirits sent to serve those who will inherit salvation?
Revelation 2:10μέλλει
Do not fear what you are about to suffer. Behold, the devil is about to throw some of you into prison to test you, and you will suffer tribulation for ten days. Be faithful even unto death, and I will give you the crown of life.

Abbott-Smith

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)

Sources: Abbott-Smith’s Manual Greek Lexicon of the New Testament (1922, public domain) and glosses from STEPBible TBESG (CC BY 4.0); STEPBible TAGNT (Greek New Testament, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.