Full Sharh — Mishkat al-Masabih 4396
وَعَن عَائِشَة قَالَتْ: سَأَلَ أُنَاسٌ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنِ الْكُهَّانِ فَقَالَ لَهُمْ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِنَّهُمْ لَيْسُوا بِشَيْءٍ» قَالُوا: يَا رَسُولَ اللَّهِ فَإِنَّهُمْ يُحَدِّثُونَ أَحْيَانًا بِالشَّيْءِ يَكُونُ حَقًّا فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «تِلْكَ الْكَلِمَةُ مِنَ الْحَقِّ يَخْطَفُهَا الْجِنِّيُّ فَيَقُرُّهَا فِي أُذُنِ وَلَيِّهِ قَرَّ الدَّجَاجَةِ فَيَخْلِطُونَ فِيهَا أَكْثَرَ مِنْ مِائَةِ كذبة»
English Translation
'A’isha told that when God’s messenger was asked by some people about kahins he replied, “They are of no account.” They said, “Messenger of God, they sometimes tell a thing which is true.” He replied, “That is a word pertaining to truth which a jinni snatches and cackles into the ear of his friend as a hen does; then they mix more than a hundred lies with it.” (Bukhari and Muslim.)
Source
Mishkat al-Masabih(مشكاة المصابيح)
Medicine and Spells
Hadith Number
4396