عن حفصة بنت عمر بن الخطاب -رضي الله عنهما- عن النبي -صلى الله عليه وسلم- قال: "من أتَى عرَّافًا فسأله عن شيء، فصدَّقه لم تُقْبَلْ له صلاةٌ أربعينَ يومًا".
[صحيح.] - [رواه مسلم.]
المزيــد ...

Hafsah bint ‘Umar ibn al-Khattāb (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "Whoever goes to a soothsayer, asks him about something and believes him, his prayers will not be accepted for forty days."
[Sahih/Authentic] - [Muslim]

Explanation

The Messenger of Allah (may Allah's peace and blessings be upon him) tells us that anyone who goes to a soothsayer – a person who claims to know the unseen – and asks him about something related to the unseen and believes him in what he says, Allah will not reward him for his prayers for forty days. This is a punishment for the serious sin that he committed. If one believes a soothsayer, he has disbelieved in the divine revelation that was sent down to Muhammad (may Allah's peace and blessings be upon him) as stated in another Hadīth. If the punishment for the one who goes to a soothsayer is as such, then what would be the punishment of the soothsayer himself! We seek refuge with Allah from this and we ask him for safety and well-being.

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1: It forbids going to diviners to ask them about matters related to the unseen and believing them in that, for it is disbelief.
2: It shows the prohibition of divination as it is one of the major sins.
3: One may be deprived of the reward for doing acts of obedience as a punishment for committing sins.