Deuteronomy 21:16
The day he wills his possessions to his sons, he should not put the firstborn son of the loved wife before the firstborn son of the unloved wife.
1 Chronicles 26:10
Hosah the Merarite had sons: Shimri the first although he was not the firstborn, his father had appointed him the first,
1 Chronicles 5:2
and though Judah was the strongest of his brothers and a ruler came from him, the rights of the firstborn belonged to Joseph
2 Chronicles 11:19-22
Mahalath gave birth to the following sons: Jeush, Shemariah, and Zaham.
2 Chronicles 21:3
Their father gave them large amounts of gold, silver, and other valuable possessions, and placed each one in charge of one of the fortified cities of Judah. But because Jehoram was the oldest, Jehoshaphat made him his successor.
Romans 8:29
Those he first recognized, he ordained in advance that they be conformed to the image of his Son, that he might be the firstborn among many brothers.
Philippians 4:8
Finally, brothers, whatever things are true, whatever things are honorable, whatever things are just, whatever things are pure, whatever things are lovely, whatever things are of good report; if there is any virtue, and if there is any praise, think about these things.
Hebrews 12:16-17
Let no one become immoral or unspiritual like Esau. He sold his birthright for a single meal!