Messenger of Allah ﷺ said, "There is neither 'Adwa (no contagious disease is conveyed to others without Allah's permission) nor Tiyara, but an evil omen may be in three a woman, a house or an animal."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ عَدْوَى وَلاَ طِيَرَةَ وَالشُّؤْمُ فِي ثَلاَثٍ فِي الْمَرْأَةِ وَالدَّارِ وَالدَّابَّةِ  

I heard Messenger of Allah ﷺ saying, "There is no Tiyara, and the best omen is the Fal." They asked, "What is the Fal?" He said, "A good word that one of you hears (and takes as a good omen).  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ لاَ طِيَرَةَ وَخَيْرُهَا الْفَأْلُ قَالُوا وَمَا الْفَأْلُ قَالَ الْكَلِمَةُ الصَّالِحَةُ يَسْمَعُهَا أَحَدُكُمْ