Anas reported that the Prophet, may Allah bless him and grant him peace, said, "There is no infection* and there are no bad omens, although I am pleased by a good omen - a good word." * 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.  

عَنِ النَّبِيِّ ﷺ لاَ عَدْوَى وَلاَ طِيَرَةَ وَيُعْجِبُنِي الْفَأْلُ الصَّالِحُ الْكَلِمَةُ الْحَسَنَةُ  

Hiba at-Tamimi related from his father that he heard the Prophet, may Allah bless him and grant him peace, said, "There is no avenging spirit (hama*), and the most truthful of omens is the good omen. The Evil Eye is a reality."  

أَخْبَرَهُ أَنَّهُ سَمِعَ النَّبِيَّ ﷺ يَقُولُ لاَ شَيْءَ فِي الْهَامِّ وَأَصْدَقُ الطِّيَرَةِ الْفَأْلُ وَالْعَيْنُ حَقٌّ