Matthew 1:23ἐστιν
“Behold, the virgin will be with child and will give birth to a son, and they will call Him Immanuel” ( which means, “God with us”).
Mark 1:6ἦν
John was clothed in camel’s hair, with a leather belt around his waist. His food was locusts and wild honey.
Luke 1:7ἦν
But they had no children, because Elizabeth was barren, and they were both well along in years.
John 1:1ἦν
In the beginning was the Word, and the Word was with God, and the Word was God.
Acts 1:12ἐστιν
Then they returned to Jerusalem from the Mount of Olives, which is near the city, a Sabbath day’s journey away.
1 Corinthians 1:18ἐστίν
For the message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God.

Abbott-Smith

εἰμί,
with various uses and significations, like the English verb to be.

I. As substantive verb.

1. Of persons and things, to be, exist: Act.17:28, Jhn.1:1, 8:58, 17:5, al; ὁ ὢν καὶ ὁ ἦν (for past ptcp.), Rev.1:4, 8, 4:8, 11:17, 16:5 (see Swete, Ap., 5; M, Pr., 228); τὰ (μὴ) ὄντα, Rom.4:17, 1Co.1:28.

2. Of times, events, etc., to be, happen, take place: Mat.24:3, Mrk.14:2, 15:42, Luk.21:23, Jhn.4:6, 23, 5:10, al.

3. to be present, be in a place, have come: Mat.2:13, 15, Mrk.1:45, 5:21, 15:40, Luk.1:80, 5:29, Jhn.7:30, al.; before εἰς, Mrk.2:1; before ἐκ, (ἐξ), Mat.1:20, 21:25, Mrk.11:30, Jhn.3:31, al.

4. Impers., ἔστι, ἦν, etc.;

(a) there is (Fr. il y a), was, etc.: Mat.16:28, Luk.16:19, Jhn.3:1, 5:2, Rom.3:10, al.; with dative (of the possessor; Bl., §37, 3), Mat.16:22, Luk.1:7, Jhn.18.10, Rom.9:2, al.; ἔστιν ὅς, ὅστις (chiefly in pl), Mat.16:28, 19:2, Mrk.9:1, al.;

(b) with inf., = ἔξεστιν (which see), it is possible: Heb.9:5, 1Co.11:20, RV (but see ICC, in l.).

II. As copula uniting subject and predicate.

1. Expressing simply identity or equivalence: Mat.5:13, 14:15, Luk.1:18, 19, Jhn.1:1, 4:19

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.