Pope Shenouda III
The Holy Bible clearly defines the meaning of the word firstborn. Prior to the establishment of Aaronic priesthood, the Divine Inspiration had said: “Sanctify to Me all the firstborn, whatever opens the womb among the children of Israel, both of man and of animal; it is Mine” (Ex.13: 2). Every firstborn was consecrated to God; dedicated to Him, whether or not a brother was born to him later. The parents did not wait until they begot him a brother, nor did the owner of the livestock wait until another offspring was born before offering and consecrating the firstborn to the Lord! But from his birth the firstborn was consecrated because he was the first offspring of the womb. Therefore there was a great possibility that any firstborn was an only son.