Luke 3:3ἁμαρτιῶν
He went into all the region around the Jordan, preaching a baptism of repentance for the forgiveness of sins,
John 1:29ἁμαρτίαν
The next day John saw Jesus coming toward him and said, “Look, the Lamb of God, who takes away the sin of the world!
Acts 2:38ἁμαρτιῶν
Peter replied, “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.
Romans 3:9ἁμαρτίαν
What then? Are we any better? Not at all. For we have already made the charge that Jews and Greeks alike are all under sin.
Hebrews 1:3ἁμαρτιῶν
The Son is the radiance of God’s glory and the exact representation of His nature, upholding all things by His powerful word. After He had provided purification for sins, He sat down at the right hand of the Majesty on high.
1 John 1:7ἁμαρτίας
But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin.

Abbott-Smith

ἁμαρτία, -ας, ἡ
(ἁμαρτάνω, which see), [in LXX chiefly for חַטָּאת and cogn. forms, also for פֶּשַׁע ,עָוֹן, etc. ;]
prop. a missing the mark; in cl. (see reff. to CR in MM, VGT, see word);

(a) guilt, sin (Plat., Arist., al.);

(b) more freq., from Æsch. down, a fault, failure. In NT (as LXX) always in ethical sense;

1. as a principle and quality of action, = τὸ ἁμαρτάνειν, a sinning, sin: Rom.5:12, 13 20; ὑφ᾽ ἁμαρτίαν εἶναι, Rom.3:9; ἐπιμένειν, Rom.6:1; ἀποθνήσκειν, νεκρὸν εἶναι τῇ ἁ., Rom.6:2, 11; τὴν ἀ. γινώσκειν, Rom.7:7; σῶμα τῆς ἁ., Rom.6:6; ἀπάτη τῆς ἁ., Heb.3:13; personified as a ruling principle, ἁ. βασιλεύει, κυριεύει, etc., Rom.5:21 6:12, 14 7:17, 20; δουλεύειν, Rom.6:6; δοῦλος τῆς ἁ., ib. 17; νόμος τῆς ἁ., Rom.7:23 8:2; δύναμις τῆς ἁ., 1Co.15:56 (cf. Gen.4:7).

2. As a generic term (disting. fr. the specific terms ἁμάρτημα, which see, etc.) for concrete wrongdoing, violation of the divine law, sin: Jhn.8:46, Jas.1:15, al.; ποιεῖν (τὴν) ἁ., Jhn.8:34, 2Co.11:7, 1Jn.3:8; εἴχειν ἁ., Jhn.9:41 15:22, 24 19:11, 1Jn.1:8; in pl. ἁμαρτίαι, sin in the aggregate, 1Th.2:16 (see Milligan, in l.); ποιεῖν ἁμαρτίας,

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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.