'Propitiation' in the Bible

wherefore it did behove him in all things to be made like to the brethren, that he might become a kind and stedfast chief-priest in the things with God, to make propitiation for the sins of the people,

and he -- he is a propitiation for our sins, and not for ours only, but also for the whole world,

in this is the love, not that we loved God, but that He did love us, and did send His Son a propitiation for our sins.