Matthew 1:20γὰρ
But after he had pondered these things, an angel of the Lord appeared to him in a dream and said, “Joseph, son of David, do not be afraid to embrace Mary as your wife, for the One conceived in her is from the Holy Spirit.
Luke 1:15γὰρ
for he will be great in the sight of the Lord. He shall never take wine or strong drink, and he will be filled with the Holy Spirit even from his mother’s womb.
Acts 1:20γὰρ
“For it is written in the book of Psalms: ‘May his place be deserted; let there be no one to dwell in it,’ and, ‘May another take his position.’
Romans 1:9γάρ
God, whom I serve with my spirit in preaching the gospel of His Son, is my witness how constantly I remember you
1 Corinthians 1:11γάρ
My brothers, some from Chloe’s household have informed me that there are quarrels among you.
Hebrews 1:5γὰρ
For to which of the angels did God ever say: “You are My Son; today I have become Your Father”? Or again: “I will be His Father, and He will be My Son”?

Abbott-Smith

γάρ,
co-ordinating particle, contr. of γε ἄρα,
verily then, hence, in truth, indeed, yea, then, why, and when giving a reason or explanation, for, the usage in NT being in general accord with that of cl.;

1. explicative and epexegetic: Mat.4:18 19:12, Mrk.1:16 5:42 16:4, Luk.11:3o, Rom.7:1, 1Co.16:5, al.

2. Conclusive, in questions, answers and exclamations: Mat.9:5 27:23, Luk.9:25 22:27, Jhn.9:30, Act.8:31 16:37 19:35, Rom.15:26, 1Co.9:10, Php.1:18 (Ellic., in l.), 1Th.2:20, al.

3. Causal: Mat.1:21 2:2, 5, 6, 3:23, Mrk.1:22, 9:6, Luk.1:15, 18, Jhn.2:25, Act.2:25, Rom.1:9, 11, 1Co.11:5, Rev.1:3, al.; giving the reason for a command or prohibition, Mat.2:20 3:9, Rom.13:11, Col.3:3, 1Th.4:3, al.; where the cause is contained in an interrog. statement, Luk.22:27, Rom.3:3 4:3, 1Co.10:29; καὶ γάρ, for also, Mrk.10:45, Luk.6:32, 1Co.5:7, al. id. as in cl. = etenim, where the καί loses its connective force (Bl., §78, 6; Kühner 3, ii, 854f.), Mrk.14:70, Luk.1:66 22:37, 2Co.13:4. The proper place of γάρ is after the first word in a clause, but in poets it often comes third or fourth, and so in late prose:

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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.