Shaikh Rabee (May Allaah preserve him) said:
Abul Hasan Al-Ash’ari announced his repentance on the pulpit. He used to be an extreme Mutazili – a leader among the leaders of the Mutazilah and he persisted in defence of this evil school of thought for forty years and repented after that. He announced his repentance and from the proofs of his repentance is that he began to author refutations against the Mutizalah and rebuttal of their doubts. So there are signs of the truthful acts of repentance which dispels the doubts (about his repentance). He publicized and manifested to the people that he follows the truth.
So there are affairs that show the truthfulness of (the repentant one) and there are factual evidences that show the untruthfulness of (the one who merely claims to have repented). He (the person) is encouraged if there are factual evidences showing his truthfulness, and (on the other hand) it is incumbent upon the Salafiyyoon to be cautious of him if there are factual evidences showing only the mere claims of his (repentance), as it can be that he is being deceitful. [Siyaanatus Salafi’ pages 79-80]
O Masjid al-Furqan’s Admin! Where are your public clarifications about sayyid qutb, even though you promoted his books of misguidance. Indeed, there is a clear example to follow in the above statement of Shaikh Rabee if you are truthful.