It is nothing (i. e. it is a mere superstition). They said: Messenger of Allah, they at times narrate to us things which we find true. Thereupon Messenger of Allah ﷺ said: That is a word pertaining to truth which a jinn snatches away and then cackles into the ear of his friend as the hen does. And then they mix in it more than one hundred lies. (Using translation from Muslim 2228b)

عَائِشَةُ سَأَلَ أُنَاسٌ رَسُولَ اللَّهِ ﷺ عَنِ الْكُهَّانِ فَقَالَ لَهُمْ رَسُولُ اللَّهِ ﷺ «لَيْسُوا بِشَيْءٍ» قَالُوا يَا رَسُولَ اللَّهِ إِنَّهُمْ يُحَدِّثُونَ أَحْيَانًا بِالشَّيْءِ يَكُونُ حَقًّا قَالَ رَسُولُ اللَّهِ ﷺ «تِلْكَ الْكَلِمَةُ مِنَ الْجِنِّ يَحْفَظُهَا فَيَقْذِفُهَا فِي أُذُنِ وَلِيِّهِ فَيَخْلِطُونَ فِيهَا أَكْثَرَ مِنْ مِائَةِ كِذْبَةٍ»