Matthew 6:24δουλεύειν
No one can serve two masters: Either he will hate the one and love the other, or he will be devoted to the one and despise the other. You cannot serve both God and money.
Luke 16:13δουλεύειν
No servant can serve two masters. Either he will hate the one and love the other, or he will be devoted to the one and despise the other. You cannot serve both God and money.”
John 8:33δεδουλεύκαμεν
“We are Abraham’s descendants,” they answered. “We have never been slaves to anyone. How can You say we will be set free?”
Acts 20:19δουλεύων
I served the Lord with great humility and with tears, especially in the trials that came upon me through the plots of the Jews.
Romans 7:6δουλεύειν
But now, having died to what bound us, we have been released from the law, so that we serve in the new way of the Spirit, and not in the old way of the written code.
Galatians 4:8ἐδουλεύσατε
Formerly, when you did not know God, you were slaves to those who by nature are not gods.

Abbott-Smith

δουλεύω
(δοῦλος), [in LXX for עָבַד, as Gen.14:4, exc. Da TH Dan.7:14, 27 (פְּלַח), Isa.56:6 (שָׁרַת pi.)* ;]
to be a slave, be subject to, serve: absol., Rom.7:6, Gal.4:25, 1Ti.6:2; with dative of person(s), Mat.6:24, Luk.15:29 16:13, Rom.9:12" (LXX) ; of nations, Jhn.8:33, Act.7:7" (LXX) ; θεῷ, τ. κυρίῳ, Mat.6:24, Luk.16:13, Act.20:19, Rom.12:11 (R, mg., καιρῷ) Rom.16:18, Eph.6:7, Col.3:24, 1Th.1:9; τ. Χριστῷ, Rom.14:18, Col.3:24; νόμῳ θεοῦ, Rom.7:25; τ. θεοῖς, Gal.4:8; τ. καιρῷ, Rom.12:11 (R, mg. for κυρίῳ); ἀλλήλοις, Gal.5:13; σὺν ἐμοί Php.2:22; τ. ἁμαρτίᾳ, Rom.6:6; νόμῳ ἁμαρτίας, Rom.7:25;
ἐπιθυμίαις κ. ἡδοναις, Tit.3:3; τ. κοιλία, Rom.16:18; μαμωνᾷ, Mat.6:24, Luk.16:13; τ. στοιχείοις τ, κόσμου, Gal.4:9 (Cremer, 217).†
(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.