Sahih al-Bukhari 5754
Sahih al-Bukhari · Book 76: Medicine · At-Tiyara (drawing an evil omen from birds, etc.)
Narrated Abu Huraira:
حَدَّثَنَا أَبُو الْيَمَانِ ، أَخْبَرَنَا شُعَيْبٌ ، عَنِ الزُّهْرِيِّ ، قَالَ أَخْبَرَنِي عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ بْنِ عُتْبَةَ ، أَنَّ أَبَا هُرَيْرَةَ ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " لاَ طِيَرَةَ، وَخَيْرُهَا الْفَأْلُ ". قَالُوا وَمَا الْفَأْلُ قَالَ " الْكَلِمَةُ الصَّالِحَةُ يَسْمَعُهَا أَحَدُكُمْ " .
I heard Allah's Messenger (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).