The ruling on the sects in the Fire, from the hadith of the splitting

Question:
Honorable Shaykh. A letter says: Regarding the saying of the Prophet (peace and blessings be upon him), “You will split into all of them in the Fire except one,” is the intention regarding these sects that they are eternal in the Fire, meaning they are disbelievers, or that they are sinners who deserve the Fire by this warning?

Answer:
They differ on this. Some of them have a deviation that necessitates disbelief, some have a deviation that necessitates open sinfulness, and some have a deviation that necessitates sin. The warning of the Fire may apply to some who are eternal in it if their deviation constitutes disbelief, or to some who are punished but not made eternal in the Fire, or to some who are pardoned. Yes, people vary in their differences, but the successful sect is safe from all of these matters. But you... And Allah the Exalted knows best, and may Allah send prayers and peace upon our Prophet Muhammad and upon his family and his Companions.