Matthew 5:28καρδίᾳ
But I tell you that anyone who looks at a woman to lust after her has already committed adultery with her in his heart.
Mark 2:6καρδίαις
But some of the scribes were sitting there and thinking in their hearts,
Luke 1:51καρδίας
He has performed mighty deeds with His arm; He has scattered those who are proud in the thoughts of their hearts.
Acts 2:26καρδία
Therefore my heart is glad and my tongue rejoices; my body also will dwell in hope,
Romans 1:21καρδία
For although they knew God, they neither glorified Him as God nor gave thanks to Him, but they became futile in their thinking and darkened in their foolish hearts.
2 Corinthians 1:22καρδίαις
placed His seal on us, and put His Spirit in our hearts as a pledge of what is to come.

Abbott-Smith

καρδία, -ας, ἡ,
[in LXX chiefly for לֵבָב ,לֵב ;]
the heart,

1. the bodily organ which is regarded as the seat of life ( 2Ki.18:14, 4Ki.9:24, al.).

2. In a psychological sense, the seat of man's collective energies, the focus of personal life, the seat of the rational as well as the emotional and volitional elements in human life, hence that wherein lies the moral and religious condition of the man (DB, ii, 317f.; DGG, ii, 344a);

(a) of the seat of physical life ( Jdg.19:5, Psa.101 (102):5 103 (104):15): Act.14:17, Jas.5:5;

(b) of the seat of spiritual life: Mat.5:8, Mrk.7:19, Luk.1:51, Act.5:3, Rom.10:9, 10 Eph.6:5, al.; pl., Mat.9:4, Mrk.2:6, al.; opposite to στόμα, χείλεα, πρόσωπον, Mat.15:8, Mrk.7:6, Rom.10:8, 9 2Co.5:12; περιτομὴ καρδίας, Rom.2:29; ἐκ κ., Rom.6:17, 1Pe.1:22; ἀπὸ τῶν κ., Mat.18:35; ἐν ὅλῃ (ἐξ ὅλης), Mat.22:37, Mrk.12:30" (LXX) ; γινώσκειν (ἐρευνᾶν, δοκιμάζειν) τὰς κ., Luk.16:15, Rom.8:27, 1Th.2:4; to think, etc., ἐν τ. κ., Mat.9:4, Mrk.2:6, Luk.12:45, Rom.10:6; συνιέναι (νοεῖν) τῇ κ., Mat.13:15, Jhn.12:40; ἐπαχύνθη ἡ κ., Mat.13:15 (LXX); πωροῦν τὴν κ., Jhn.12:40; κ. εὐθεῖα,

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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.