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Muslim has narrated, on the authority of one of the wives of the Prophet (Hafsah - may Allah be pleased with her), that Allah's Prophet said:
"Whoever went to a fortune-teller and asked him about some matter (i.e. of the unseen) and believed him, will have his prayer rejected for forty days."
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It is reported on the authority of Abu Hurairah (ra) that the Prophet said:
"Whoever went to a fortune-teller and believed in what he said, has disbelieved in what was revealed to Muhammad."
^Hope that helps! :)
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