Romans 8:29

For he determined beforehand that those whom he foreknew should be conformed to the image of his Son, in order that he might be the firstborn among many brethren.

Hebrews 12:23

and to the church of the firstborn, who are enrolled in heaven; and to God the Judge of all, and to the spirits of righteous men made perfect;

Treasury of Scripture Knowledge

Summary

Now the sons of Caleb the brother of Jerahmeel were, Mesha his firstborn, which was the father of Ziph; and the sons of Mareshah the father of Hebron.

His first-born

Bible References

His first-born

Romans 8:29
For he determined beforehand that those whom he foreknew should be conformed to the image of his Son, in order that he might be the firstborn among many brethren.
Hebrews 12:23
and to the church of the firstborn, who are enrolled in heaven; and to God the Judge of all, and to the spirits of righteous men made perfect;