Luke 12:19εὐφραίνου
Then I will say to myself, “You have plenty of good things laid up for many years. Take it easy. Eat, drink, and be merry!”’
Acts 2:26ηὐφράνθη
Therefore my heart is glad and my tongue rejoices; my body also will dwell in hope,
Romans 15:10εὐφράνθητε
Again, it says: “Rejoice, O Gentiles, with His people.”
2 Corinthians 2:2εὐφραίνων
For if I grieve you, who is left to cheer me but those whom I have grieved?
Galatians 4:27εὐφράνθητι
For it is written: “Rejoice, O barren woman, who bears no children; break forth and cry aloud, you who have never travailed; because more are the children of the desolate woman than of her who has a husband.”
Revelation 12:12εὐφραίνεσθε
Therefore rejoice, O heavens, and you who dwell in them! But woe to the earth and the sea; with great fury the devil has come down to you, knowing he has only a short time.”

Abbott-Smith

εὐφραίνω
[in LXX chiefly for שָׂמַח, qal, pi. ;]
to cheer, gladden: with accusative of person(s), opposite to λυπεῖν, 2Co.2:2. Pass., to be happy, rejoice, make merry: Luk.15:32, Act.2:26" (LXX) Rom.15:10 (LXX), Gal.4:27 (LXX), Rev.11:10 12:12; before ἐν, Act.7:41; ἐπί with dative, Rev.18:20; of merry-making at a feast (3Ki.4:20; of. Kennedy, Sources, 155; Field, Notes, 69 f.), Luk.12:19 15:23-24, 29" (LXX) (λαμπρῶς) Luk.16:19.†
(AS)

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.