كتاب السلام
39
The Book of Greetings
(33)
Chapter: There Is No 'Adwa, No Tiyarah (Evil Omens), No Hamah. No Safar, No Nawa', And No Ghoul, And No Sick Camel Should Be Brought To A Healthy Camel
(33)
باب لاَ عَدْوَى وَلاَ طِيَرَةَ وَلاَ هَامَةَ وَلاَ صَفَرَ
Sahih Muslim 2222 a

Jabir reported Allal's Messenger (ﷺ) as saying:

There is no transitive disease, no ill omen, no ghoul.

Note: The majority of scholars interpret this to mean that these things in and of themselves do not transmit or cause harm through supernatural or hidden means but that Allah is ultimately in control and any fearful superstition around these is false.
حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، حَدَّثَنَا زُهَيْرٌ، حَدَّثَنَا أَبُو الزُّبَيْرِ، عَنْ جَابِرٍ، ح

وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا أَبُو خَيْثَمَةَ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ لاَ عَدْوَى وَلاَ طِيَرَةَ وَلاَ غُولَ ‏"‏ ‏.‏

Reference : Sahih Muslim 2222 a
In-book reference : Book 39, Hadith 147
USC-MSA web (English) reference : Book 26, Hadith 5514
  (deprecated numbering scheme)