Reply To: Which sins carry eternal punishment?

I once heard from R’ Shimshon Pincus ZT”L that the worst one is a man having a child with a non-jewish girl as this is irreversible (the child is permanently a non-Jew)whereas anything else can be rectified (heard on a shiur given on leil tisha b’av where he bemoans the churban of this dor – intermarriage)