Infidelity

Concept

Infidelity in its biblical sense denotes unbelief toward God — the failure or refusal to trust his word, promises, and revelation. The Hebrew root aman ("to trust, believe") provides the positive baseline: Abraham "believed God, and it was counted to him as righteousness" (Gen. 15:6; Rom. 4:3). Infidelity is the opposite — doubting or openly rejecting God's word. Israel in the wilderness repeatedly demonstrated it: they doubted God's power to provide water, food, and victory, despite the evidence of the Exodus (Num. 14:11; Ps. 78:22).

The OT also uses the marriage metaphor: Israel's abandonment of God for idols is called infidelity or harlotry (Hos. 2:2; Jer. 3:8; Ezek. 16). In the NT, unbelief (Greek apistia) is presented as the fundamental problem that prevents reception of God's grace: Jesus "did not do many mighty works" in Nazareth "because of their unbelief" (Matt. 13:58). Hebrews warns against "an evil, unbelieving heart, leading you to fall away from the living God" (Heb. 3:12).