In Genesis 25:31-34, Esau despises his birthright by selling it for stew — exactly the firstborn right that Deuteronomy 21:17 commands be honored.

Genesis 25:32 records Esau despising his birthright, directly illustrating the value of the double portion that the law protects.

Genesis 25:34 concludes Esau selling his birthright, a narrative example of the birthright being traded away.

1 Chronicles 5:1 recounts Reuben losing his birthright due to sin, showing an exception to the law's protection of the firstborn.

1 Chronicles 5:2 clarifies that the birthright went to Joseph's sons despite Judah's leadership, reinforcing the transfer of double portion.

In Genesis 48:22, Jacob gives Joseph a double portion — an example of the firstborn's double inheritance from Deuteronomy 21:17, here transferred from Reuben.

In 2 Kings 2:9, Elisha requests a 'double portion' of Elijah's spirit — directly invoking the firstborn's inheritance right from Deuteronomy 21:17 as a model for prophetic succession.

In Luke 15:12, the younger son demands his share of the inheritance — a scenario that presupposes the firstborn's double portion from Deuteronomy 21:17, as the father divides property.

In Hebrews 12:23, believers are called 'the assembly of the firstborn' — a title drawing on the privileged status of the firstborn in Deuteronomy 21:17, now applied to all in Christ.

Genesis 49:3 explicitly calls Reuben the firstborn, affirming the status that the double portion law addresses.

In Joshua 17:1, Manasseh as Joseph's firstborn receives an inheritance — consistent with the firstborn right protected in Deuteronomy 21:17.

In Isaiah 61:7, God promises a double portion to Israel as restoration — using the same phrase from Deuteronomy 21:17 to signify full inheritance and blessing.