Ibn Abbas reported: The Prophet, peace and blessings be upon him, said, “The evil eye is real. If anything could precede the divine decree, it would be preceded by the evil eye. When you are asked to perform a ritual bath, then do so.”
Source: Ṣaḥīḥ Muslim 2188
Grade: Sahih (authentic) according to Muslim
عَنْ ابْنِ عَبَّاسٍ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ الْعَيْنُ حَقٌّ وَلَوْ كَانَ شَيْءٌ سَابَقَ الْقَدَرَ سَبَقَتْهُ الْعَيْنُ وَإِذَا اسْتُغْسِلْتُمْ فَاغْسِلُوا
2188 صحيح مسلم كتاب السلام باب الطب والمرض والرقى