Good Manners and Form (Al-Adab)
Ṣaḥīḥ al-Bukhārī 6213
تِلْكَ الْكَلِمَةُ مِنَ الْحَقِّ يَخْطَفُهَا الْجِنِّيُّ، فَيَقُرُّهَا فِي أُذُنِ وَلِيِّهِ قَرَّ الدَّجَاجَةِ، فَيَخْلِطُونَ فِيهَا أَكْثَرَ مِنْ مِائَةِ كَذْبَةٍ
tilka al-kalimah mina al-ḥaqqi yakhṭafuhā al-jinniyyu, fayaqurruhā fī udhuni waliyyihi qarra ad-dajājah, fayakhliṭūna fīhā akthara min māʾah kadhbatin
Transliteration generated from the Arabic vowel marks
The full narration
Narrated `Aisha:Some people asked Allah's Messenger (ﷺ) about the fore-tellers. Allah's Messenger (ﷺ) said to them, "They are nothing (i.e., liars)." The people said, 'O Allah's Messenger (ﷺ) ! Sometimes they tell something which comes out to be true." Allah's Messenger (ﷺ) said, "That word which comes to be true is what a jinx snatches away by stealing and then pours it in the ear of his fore-teller with a sound similar to the cackle of a hen, and then they add to it one-hundred lies
Source
Ṣaḥīḥ al-Bukhārī · 6213