Numbers 3:13 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.
Since He had spared the firstborn they belonged to Him. They should have died. They should have lost everything but He gave them life. They now owe their lives to Him. I should be dead and in hell but He has rescued me. He has saved me. I belong to Him. I didn’t lose it all like I should have because He took my place. Since He died for me I can live for Him. I give Him my life, my all. He saved me!