Treasury of Scripture Knowledge

Summary

Because all the firstborn are mine; for on the day that I smote all the firstborn in the land of Egypt I hallowed unto me all the firstborn in Israel, both man and beast: mine shall they be: I am the LORD.

Bible References

Because

Luke 2:23
as it is written in the law of the Lord that every male which is a first born shall be called holy to the Lord,
Hebrews 12:23
and to the church of the first-born who are enrolled in heaven, and to a judge the God of all, and to spirits of the righteous made perfect,