Matthew 1:19δίκαιος
Because Joseph her husband was a righteous man and was unwilling to disgrace her publicly, he resolved to divorce her quietly.
Luke 1:6δίκαιοι
Both of them were righteous in the sight of God, walking blamelessly in all the commandments and decrees of the Lord.
Acts 4:19δίκαιόν
But Peter and John replied, “Judge for yourselves whether it is right in God’s sight to listen to you rather than God.
Romans 1:17δίκαιος
For the gospel reveals the righteousness of God that comes by faith from start to finish, just as it is written: “The righteous will live by faith.”
1 John 2:29δίκαιός
If you know that He is righteous, you also know that everyone who practices righteousness has been born of Him.
Revelation 15:3δίκαιαι
and they sang the song of God’s servant Moses and of the Lamb: “Great and wonderful are Your works, O Lord God Almighty! Just and true are Your ways, O King of the nations!

Abbott-Smith

δίκαιος, -α, -ον
(δίκη), [in LXX chiefly for צַדִּיק (for rendering of צַדִּיק in sense of correct, see Deiss., BS, 115 f.); sometimes for נָקִי as Pro.1:11, al. ;]
in early Gk. writers

(a) of persons, observant of δίκη, custom, rule, right, righteous in performing duties to gods and men ;

(b) of things, righteous, in accordance with right.
In NT

1. righteous, chiefly in the broad sense, as above, of the person or thing corresponding to the Divine standard of right

(a) of persons: of God, Rom.3:26, 1Jn.2:29 Jn 3:7; of Christ, Act.3:14 7:52 22:14, 1Pe.3:18, 1Jn.2:1; of men, Mat.1:19 (Abbott, Essays, 75 f.) Mat.10:41 13:17, 43 13:49, Luk.1:6, 17, Rom.5:7, 1Ti.1:9, Jas.5:6, 1Pe.3:12, 1Jn.3:7, Rev.22:11, al.; δ. καὶ εὐλαβής, Luk.2:25; ἅγιος, Mrk.6:20; ἀγαθός, Luk.23:50; φοβούμενος τ. θεόν, Act.10:22; opposite to ἀμαρτωλοὶ καὶ ἀσεβεῖς, 1Pe.4:18; ἄδικοι, Mat.5:45, Act.24:15; δ. ἐκ πίστεως, Rom.1:17, Gal.3:11, Heb.10:38" (LXX) ; δ. παρὰ τ. θεῷ, Rom.2:13

(b) of things: ἔργα δ., opposite to πονηρὰ, 1Jn.3:12; ἐντολή, Rom.7:12; metaphorically, αἷμα, Mat.23:35; τὸ δ., Luk.12:57; δ. ἐστιν, Act.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.