Reconciling the hadith "Whoever says there is no god but Allah will enter Paradise" with the hadith "All of them are in the Fire except one"

Question:
This questioner, may Allah reward you, asks: How do we reconcile the hadith of the Messenger (peace and blessings be upon him) that whoever says , with the hadith of the Messenger (peace and blessings be upon him) that my Ummah will split into three ?

Answer:
Yes. Ah. There is no contradiction between the two hadiths. When it is said that whoever says "There is no god but Allah," it does not mean merely saying it with the tongue, but rather that he says it sincerely for Allah the Exalted and disbelieves in what is worshipped besides Allah. This is specified in other hadiths: Allah has made him safe from the Fire. Likewise, in the hadith, whoever says "There is no god but Allah" sincerely from his heart.
This is one aspect. The second aspect is the hadith of the Ummah's division ; it does not mean that all seventy-two sects are disbelievers. They are not disbelievers, even if they have deviations. They may enter the Fire by way of the warning, then come out of it afterward. They enter the Fire according to their crimes and deviations, but they do not remain in it eternally.
"Entering Paradise" does not mean entering it immediately. His entry may be delayed, even if he says "There is no god but Allah." His entry is delayed and he is punished in the Fire, as it is well known that the sinners among the monotheists are either forgiven by Allah or punished according to the measure of their sins. So there is no contradiction between the two hadiths, and praise be to Allah.