Luke 2:23

(as it is written in the law of the Lord, "Every male who opens the womb shall be called holy to the Lord"),

Hebrews 12:23

and 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

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, "Every male who opens the womb shall be called holy to the Lord"),
Hebrews 12:23
and 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,