Matthew 4:9ἐὰν
“All this I will give You,” he said, “if You will fall down and worship me.”
Mark 1:40ἐὰν
Then a leper came to Jesus, begging on his knees: “If You are willing, You can make me clean.”
Luke 4:6ἐὰν
“I will give You authority over all these kingdoms and all their glory,” he said. “For it has been relinquished to me, and I can give it to anyone I wish.
John 3:2ἐὰν
He came to Jesus at night and said, “Rabbi, we know that You are a teacher who has come from God. For no one could perform the signs You are doing if God were not with him.”
1 Corinthians 4:15ἐὰν
Even if you have ten thousand guardians in Christ, you do not have many fathers; for in Christ Jesus I became your father through the gospel.
1 John 1:6ἐὰν
If we say we have fellowship with Him yet walk in the darkness, we lie and do not practice the truth.

Abbott-Smith

ἐάν, contr. fr. εἰ ἄν,
conditional particle,
representing something as "under certain circumstances actual or liable to happen," but not so definitely expected as in the case of εἰ with ind. (Bl., §65, 4; cf. Jhn.13:17, 1Co.7:36), if haply, if;

1. with subjc. (cl.);

(a) pres.: Mat.6:22, Luk.10:6, Jhn.7:17, Rom.2:25, 26 al.;
{

(b) aor. (= Lat. fut. pf.): Mat.4:9 16:26 (cf. ptcp. in Luk.9:25; M, Pr., 230), Mrk.3:24, Luk.14:34, Jhn.5:43, Rom.7:2, al.; = cl. εἰ, with opt., Jhn.9:22 11:57, Act.9:2; as Heb. אִם = ὅταν, Jhn.12:32 14:3, I Jhn.2:28 3:2, Heb.3:7" (LXX) .

2. C. indic, (as in late writers, fr. Arist. on; see WH, App., 171; VD, MGr. 2, App., §77; Deiss., BS, 201f., LAE, 155, 254; M, Pr., 168, 187; Bl., §65, 4);

(a) fut.: Mat.18:19 T, Luk.19:40, Act.7:7;

(b) pres.: 1Th.3:8 (see Milligan, in l.).

3. With other particles: ἐ. καί (Bl., §65, 6), Gal.6:1; ἐ. μή (M, Pr., 185, 187; Bl., l.with), with subjc. pres., Mat.10:13, 1Co.8:8, Jas.2:17, 1Jn.3:21; aor., Mat.6:15, Mrk.3:27, Jhn.3:3, Rom.10:15, Gal.1:8 2:16 (see Lft., Ellic., in ll.); ἐ. τε . . . ἐ. τε, [in LXX for אִם . . . אִם, Est.19:13, al.,]

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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.