Matthew 1:18ἐν
This is how the birth of Jesus Christ came about: His mother Mary was pledged in marriage to Joseph, but before they came together, she was found to be with child through the Holy Spirit.
Luke 1:1ἐν
Many have undertaken to compose an account of the things that have been fulfilled among us,
John 1:4ἐν
In Him was life, and that life was the light of men.
Acts 1:3ἐν
After His suffering, He presented Himself to them with many convincing proofs that He was alive. He appeared to them over a span of forty days and spoke about the kingdom of God.
Romans 1:2ἐν
the gospel He promised beforehand through His prophets in the Holy Scriptures,
1 Corinthians 1:2ἐν
To the church of God in Corinth, to those sanctified in Christ Jesus and called to be holy, together with all those everywhere who call on the name of our Lord Jesus Christ, their Lord and ours:

Abbott-Smith

ἐν,
prep, (the most frequently of all in NT), with dative (= Heb. בְּ, Lat. in, with abl.).

I. Of place, with dative of thing(s), of person(s), in, within, on, at, by, among: ἐν τ. πόλει, Luk.7:37; τ. οφθαλμῷ, Mat.7:3; τ. κοιλίᾳ, Mat.12:40; τ. ὄρει, 2Pe.1:18; τ. θρόνῳ, Rev.3:21; τ. δεξιᾷ τ. θεοῦ, Rom.8:34; ἐν ἡμῖν [Abbott-Smith has ὑμῖν.], Luk.1:1; of books, ἐν τ. βιβλίῳ, Gal.3:10; τ. νόμῳ, Mat.12:5, al.; ἐν τοῖς τ. Πατρός, in my Father's house (RV; cf. M, Pr., 103), Luk.2:49; trop., of the region of thought or feeling, ἐν τ. καρδίᾳ (-αις), Mat.5:28, 2Co.4:6, al.; τ. συνειδήσεσιν, 2Co.5:11; after verbs of motion, instead of εἰς (constructio praegnans, a usage extended in late Gk. beyond the limits observed in cl.; cf. Bl., §41, 1; M, Th., 12), ἀποστέλλω . . . ἐν, Mat.10:16. δέδωκεν ἐν τ. χειρί (cf. τιθέναι ἐν χερσί, Hom., Il., i, 441, al.), Jhn.3:35; id. after verbs of coming and going (not in cl.), εἰσῆλθε, Luk.9:46; ἐξῆλθεν, Luk.7:17.

II. Of state, condition, form, occupation, etc.: ἐν ζωῇ, Rom.5:10; ἐν τ. θανάτῳ, 1Jn.3:14; ἐν πειρασμοῖς, 1Pe.1:6; ἐν εἰρήνῃ, Mrk.5:25; ἐν δόξῃ, Php.4:19;

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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.