What about 1 John 2:1-2:
My dear children, I write this to you so that you will not sin. But if anybody does sin, we have an advocate with the Father—Jesus Christ, the Righteous One. He is the atoning sacrifice for our sins, and not only for ours but also for the sins of the whole world.
Did you notice it doesn't say that he is the potential atonement, but the actual one? Let me copy/paste something I wrote just yesterday about this verse:
One thing I'd like to point out is that if the verse (1 John 2:2) on the surface has difficulties squaring away with the Calvinist viewpoint, it likewise has difficulties squaring away with the non-Calvinist or Arminian (Unlimited Atonement) viewpoint.
Why?
Because the verse doesn't say that Christ is merely the
potential propitiation (for whatever group John goes on to mention), but that He is the actual one.
This does not, on the surface, fit into the Arminian's understanding of Unlimited Atonement, either. Arminianism says that Christ's death only made it possible for people to be saved, but this verse doesn't say anything about possibility or potentiality. It says that Christ
is the propitiation. Not the potential propitiation.
Therefore it is mind boggling that they (Arminians) think they can claim this verse as their own, or that it only poses problems for Calvinism. When in fact, since they are taking "us and the whole world" to mean "every individual", they must water down, lessen, or change the idea of propitiation into that of potentiality. In other words, the only way this verse does not pose problems for their view is if they change the meaning of words, which ironically is what they accuse Calvinists of doing
It seems to me that since the verse says he is the actual propitiation or atonement, then when John says "not only us, but the whole world", he cannot be referring to every individual, but rather is just using a sweeping generalization to refer to all nations of the world. In fact if you look at what John had already wrote about Christ's death in John 11:51-52, we learn that Christ's death was not for the nation only (not us only), but also to gather into one the children of God that are scattered across the world (but the whole world). There is parallel between John 11:51-52 and 1 John 2:2.
It is a mistake to automatically assume that the dividing line between "us..and the whole world" is believers and unbelievers. What is more likely is since we have John 11:51-52 to guide us, and we have the fact that John is a Jew, writing to Jews (as his direct audience), that the dividing line between "us" and "the whole world" is Jews and Gentiles.