The meaning of Heir in the Bible
(From Easton's Bible Dictionary)

Under the patriarchs the property of a father was divided among the sons of his legitimate wives (Genesis 21:10; 24:36; 25:5), the eldest son getting a larger portion than the rest. The Mosaic law made specific regulations regarding the transmission of real property, which are given in detail in Deuteronomy 21:17; Numbers 27:8; 36:6; 27:9-11. Succession to property was a matter of right and not of favour. Christ is the "heir of all things" (Hebrews 1:2; Colossians 1:15). Believers are heirs of the "promise," "of righteousness," "of the kingdom," "of the world," "of God," "joint heirs" with Christ (Galatians 3:29; Hebrews 6:17; 11:7; James 2:5; Romans 4:13; 8:17).

See more on the meaning of Heir in the Bible:
Heir {International Standard Bible Encyclopedia}

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