Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) was asked about the ruling on one who claims to have knowledge of the unseen. He replied:

The ruling on one who claims to have knowledge of the unseen is that he is a kaafir, because he has disbelieved in Allaah. Allaah says (interpretation of the meaning):

“Say: None in the heavens and the earth knows the Ghaib (Unseen) except Allaah, nor can they perceive when they shall be resurrected”

[al-Naml 27:65]

If Allaah has commanded His Prophet Muhammad (peace and blessings of Allaah be upon him) to proclaim to all that no one in the heavens or on earth has knowledge of the unseen except Allaah, then whoever claims to have knowledge of the unseen has denied what Allaah has told us here.

We say to them: How can you possibly have knowledge of the unseen when the Prophet (peace and blessings of Allaah be upon him) did not have knowledge of the unseen? Are you better or the Messenger (peace and blessings of Allaah be upon him)? If they say, “We are better than the Messenger” then they become kaafirs by saying that. If they say, “He is better,” then why was the unseen concealed from him but you have knowledge of it?? Allaah says of Himself (interpretation of the meaning):

“(He Alone is) the All‑Knower of the Ghayb (Unseen), and He reveals to none His Ghayb (Unseen).

27. Except to a Messenger (from mankind) whom He has chosen (He informs him of the Unseen as much as He likes), and then He makes a band of watching guards (angels) to march before him and behind him.”

[al-Jinn 72:26]

The second verse attests to the kufr of the one who claims to have knowledge of the unseen. And Allaah commanded His Prophet (peace and blessings of Allaah be upon him) to announce to all (interpretation of the meaning):

“Say (O Muhammad): I don’t tell you that with me are the treasures of Allaah, nor (that) I know the Unseen; nor I tell you that I am an angel. I but follow what is revealed to me”

[al-An’aam 6:50]

[Majmoo’ Fataawa al-Shaykh Ibn ‘Uthaymeen, 1 Shawwaal, no. 22]