Like a tattoo. Regarding such souls our Sages say repentance is kept from them and such a soul has no share in the world to come. Hashem told Avraham not to worry. From Hashem's perspective, having made that ever so high place in heaven where all Bnei Yisrael are one and untainted, even the pigmentally challanged souls will just require a stronger detergent, maybe a little laser surgeory and an extra rinse cycle. In the end, all will come out clean and eternally inherit the land.
Every soul has a share in the world to come.
And all that goes on in the spiritual world is manifest in this physical world. Just as every Jew has a share in the world to come, so too does every Jew have a share in the land of Israel. Israel parallels the World to Come. But as Hashem assured Avraham, from the Torah's perspective, some will be left out, but from Hashem's perspective everyone has a place in each. The begginning of the parsha was Pinchas killing Zimri and Cosbi.