How do we respond to the "Group of Emigration and Declaring Disbelief" who declare disbelief based on the commission of a major sin?

The questioner : We have mentioned to individuals of the "Group of Declaring Disbelief" that those who commit major sins may be forgiven, or they may enter the Fire for a specified period and then... not be kept there eternally. They said that these people have repented partially, but their repentance does not purify them completely from their sins, as if the hudud (fixed punishments) are not established against them, for example. They cited a hadith—meaning in its sense—that some people will be reminded by Allah (Mighty and Majestic) of their sins on the Day of Resurrection, and then they will say: "My Lord, I have repented, I have repented." What is the extent of the authenticity of this statement and this hadith?

The Shaykh : As for the hadith with this exact wording, I do not know it. And you, as a student of knowledge, must know how to handle such matters. When one of these people called the "Group of Emigration and Declaring Disbelief" mentions a hadith... instead of waiting to get the opportunity to gather with the shaykh you are afflicted with, who is Al-Albani, and asking him about this hadith, you should address the question to him directly. Say to him: "Where did you get this hadith from? Is it a valid hadith? And who narrated it?" In this way, we put a limit on these people arguing with whatever they please, and then you will lighten the burden on us. I swear by Allah, I did not know this hadith and did not hear it until this moment. Perhaps, because he is interested in this hadith, he may have seen it in a book that tells you: "This was narrated by al-Bazzar," for example. And in that case, I would immediately go back and check al-Bazzar. But now, if I want to check, what do I want to check? Hundreds of books! And whether we find it or not!
As for the interpretation you mentioned earlier, this is evidence that the group is evolving. Where did it come from that this person repented but his repentance was not sincere? Is the one who repented but whose repentance was not sincere a sinner or not? He is a sinner, right? So, will these people be forgiven or not? Then, stick to His saying (Mighty and Majestic): ; because this verse is actually, for these ignorant people, the breaking point; because the text is comprehensive and exclusive, as the scholars say, He forgives what is less than that, meaning He forgives what is not shirk (associating partners with Allah). So what are major sins? What are major sins? This is a foreign philosophy in Islam. So these people are the tails of those Khawarij who rebelled against the Commander of the Faithful, and it became their doctrine to rebel against all the caliphs who came after him.