مَنْ أَتَى عَرَّافًا فَسَأَلَهُ عَنْ شَيْءٍ لَمْ تُقْبَلْ لَهُ صَلَاةٌ أَرْبَعِينَ لَيْلَةً.
Whoever visits a diviner and asks him about something will not have his prayer accepted for forty nights.
This hadith gives a severe warning against approaching a diviner for reports about hidden matters. Even consulting such a person is treated seriously, because it gives attention to a claim that lacks legitimate authority.