Matthew 5:18ἓν
For I tell you truly, until heaven and earth pass away, not a single jot, not a stroke of a pen, will disappear from the Law until everything is accomplished.
Mark 2:7εἷς
“Why does this man speak like this? He is blaspheming! Who can forgive sins but God alone?”
Luke 5:3ἓν
Jesus got into the boat belonging to Simon and asked him to put out a little from shore. And sitting down, He taught the people from the boat.
John 1:3ἓν
Through Him all things were made, and without Him nothing was made that has been made.
1 Corinthians 3:8ἕν
He who plants and he who waters are one in purpose, and each will be rewarded according to his own labor.
Revelation 4:8ἓν
And each of the four living creatures had six wings and was covered with eyes all around and within. Day and night they never stop saying: “Holy, Holy, Holy, is the Lord God Almighty, who was and is and is to come!”

Abbott-Smith

εἷς
ιά, ἕν, genitive ἑνός, μιᾶς, ἑνός,
cardinal numeral, one;

1. one, as opposite to many: Mat.25:15, Rom.5:12, 1Co.10:8, al.; as subst., Rom.5:15, Eph.2:14; id. with genitive partit., Mat.5:19, al.; before ἐκ (ἐξ), Mrk.14:18, Jhn.6:8, al.; metaphorically, of union and concord, Jhn.10:30 17:11, Rom.12:4-5, Php.1:27; ἀπὸ μιᾶς (B1., § 44, 1), Luk.14:18; with neg., εἷς. . . οὐ (μή), more emphatic than οὐδείς, no one, none (cl.), Mat.5:18 10:29, Luk.11:46 12:6.

2. Emphatically, to the exclusion of others;

(a) a single (one): Mat.21:24, Mrk.8:14; absol., 1Co.9:24, al.; οὐδὲ εἷς, Mat.27:14, Jhn.1:3, Rom.3:10, al.;

(b) one, alone: Mrk.2:7 10:18, Luk.18:19;

(with) one and the same: Rom.3:30, 1Co.3:8 11:5 12:11, 1Jn.5:8.

3. In late Gk., with weakened force, = τις or indef. art. (of. Heb. אֶחָד, Gen.22:13, al.; see B1., § 45, 2; M, Pr., 96 f.): Mat.8:19 19:6, Rev.8:13, al.; εἷς τις (Bl., l.with), Luk.22:50, Jhn.11:49

4. Distributively: εἷς καστος (cl.), Luk.4:40, Act.2:6, al.; εἷς . . . καὶ εἷς (cl., εἷς μὲν . . . εἷς δέ), Mat.17:4, Mrk.9:5, Jhn.20:12, al. (cf. LXX and use of Heb. אֶחָד, Exo.17:12

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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.