Don’t forget the story of Abraham’s sacrifice of Isaac. He believed God was asking him to sacrifice his first born son, and was ready to obey. And then it was not to be so, and the ram was sacrificed instead. So perhaps we must be ready to offer to God what Abraham was asked to offer.
I have been to Jewish ceremonies called Pidyon Ha-Ben, the redemption of the first born (son), The father must pay the Kohen a certain amount in shekles in order to redeem his son. This goes back, I believe, to the slaughtering of the first born boys in Egypt, but later, in Temple Days, to the offering of the first born animals in the Temple. This was a way for Jews to redeem their sons rather than have them sacrificed.