The Prophet ﷺ said, "No 'Adwa nor Tiyara; but I like Fal." They said, "What is the Fal?" He said, "A good word."  

عَنِ النَّبِيِّ ﷺ قَالَ لاَ عَدْوَى وَلاَ طِيَرَةَ وَيُعْجِبُنِي الْفَأْلُ قَالُوا وَمَا الْفَأْلُ قَالَ كَلِمَةٌ طَيِّبَةٌ  

Messenger of Allah ﷺ said, "there is neither 'Adwa nor Tiyara, and an evil omen is only in three: a horse, a woman and a house."  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ عَدْوَى وَلاَ طِيَرَةَ إِنَّمَا الشُّؤْمُ فِي ثَلاَثٍ فِي الْفَرَسِ وَالْمَرْأَةِ وَالدَّارِ  

When taking omens was mentioned in the presence of the Prophet ﷺ, he said: The best type is the good omen, and it does not turn back a Muslim. If one of you sees anything he dislikes, he should say: O Allah, no one brings good things except Thee, and no one averts evil things except Thee and there is no might and power but in Allah.  

ذُكِرَتِ الطِّيَرَةُ عِنْدَ النَّبِيِّ ﷺ فَقَالَ أَحْسَنُهَا الْفَأْلُ وَلاَ تَرُدُّ مُسْلِمًا فَإِذَا رَأَى أَحَدُكُمْ مَا يَكْرَهُ فَلْيَقُلِ اللَّهُمَّ لاَ يَأْتِي بِالْحَسَنَاتِ إِلاَّ أَنْتَ وَلاَ يَدْفَعُ السَّيِّئَاتِ إِلاَّ أَنْتَ وَلاَ حَوْلَ وَلاَ قُوَّةَ إِلاَّ بِكَ