It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) concerning this verse: "And whoever does not judge by what Allah has revealed, then it is they who are the disbelievers" [Surah al-Ma'idah: 44] that he said: "This is not the disbelief that these people (the Khawarij and others) take it to be. It is not a disbelief that takes one out of the religion; rather it is kufrun duna kufr, 'a disbelief lesser than disbelief'." This hadith has an authentic (sahih) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.