Strong's numbers

δικαιόω G1344

dikaióō

dik-ah-yo'-o

from δίκαιος; to render (i.e. show or regard as) just or innocent:--free, justify(-ier), be righteous.

δικαιόω, -ῶ (< δίκαιος), [in LXX chiefly for צדק pi., hi., (1) as Ez 16:51, Je 3:11 (cf. NT usage); (2) as De 25:1; Ex 23:7, Is 50:8 ;]

1. in cl.,

(a) c. acc rei, to deem right;

(b) c. acc pers., to do one justice; pass., δικαιοῦσθαι, to be treated rightly, opp. to ἀδικεῖσθαι.

2. In NT, as in LXX, and as usual with verbs in -όω from adjectives of moral meaning;

(1) to show to be righteous: Mt 11:19, Lk 7:35, Ro 3:4 (LXX), I Ti 3:16;

(2) to declare, pronounce righteous: Lk 7:29 10:29 16:15 18:14, Ro 2:13 3:24, 26, 28 4:5 8:30, 33, Tit 3:7; seq. ἀπό, Mt 11:19, Lk 7:35, Ac 13:39, Ro 6:7; ἐκ πίστεως, Ro 3:30 5:1, Ga 2:16 3:8, 24; ἐξ ἔργων, Ro 3:20 (LXX) 4:2, Ga 2:16, Ja 2:21, 24, 25; ἐκ τ. λόγων, Mt 12:37; διὰ τ. πίστεως, Ro 3:30; c. dat., Ro 3:24, 28, Tit 3:7; seq. ἐν, Ac 13:39, Ro 3:4 5:9, I Co 4:4 6:11, Ga 2:17 3:11 5:4, I Ti 3:16 (v. Cremer, 193, 693; DB, ii, 826 ff.).†

From G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), in the public domain.

Shown in the King James Version (KJV), whichever translation you read in — it is the text these numbers are tagged against.

1 Timothy 3:16
And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.
Titus 3:7
That being justified by his grace, we should be made heirs according to the hope of eternal life.
James 2:21
Was not Abraham our father justified by works, when he had offered Isaac his son upon the altar?
James 2:24
Ye see then how that by works a man is justified, and not by faith only.
James 2:25
Likewise also was not Rahab the harlot justified by works, when she had received the messengers, and had sent them out another way?
Revelation 22:11
He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still: and he that is holy, let him be holy still.