Or HaChaim on Leviticus 26:30/אור החיים על ויקרא כ״ו:ל׳

1 וגעלה נפשי אתכם, "and My soul will abhor you." Why did the Torah have to spell this out? It is something that we can extrapolate from verse 11 where G'd had said that as long as the Israelites would observe the commandments they would be blessed in that G'd would not abhor them. Clearly such a blessing would not continue when the people turned sinful. If G'd wanted to write how blessings would be reversed during periods when the Jewish people rebelled against G'd, the Torah should have presented all of the previously mentioned blessings as being reversed.

2We must assume therefore, that G'd listed the various punishments independent of the fact that the blessings would now be absent. I believe the message of the verse is that even the righteous who would live during these times when the bulk of the people turned sinful would not enjoy a display of G'd's favour. We find a statement to this effect in Hoseah 4,5 that "even the prophet who is among you will stumble." Another meaning of all this is that the gift of prophecy will be withdrawn [or handed to totally ineffectual individuals such as children or idiots, Ed.] so that no longer will there be prophets to admonish the people. G'd's "soul" manifests itself through His communication with His prophets. This is just about the worst curse there is and it is the reason the Torah mentioned it only after having already listed many other curses. Tragically, we are still witnessing this curse as being in effect in our own days.