The chicken nor the egg came first. It was the rooster! Can't have an egg without a chicken AND a rooster.
he hath poured out his soul unto death...and he bare the sin of many
Therefore while he was on the earth, he offered for a sacrifice his own life for the sins of the people
JST Heb. 8:4
For these are they whose sins he has borne; these are they for whom he has died, to redeem them from their transgressions
And so it was made known among the dead...that redemption had been wrought through the sacrifice of the Son of God upon the cross.