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إِذَا سَمِعْتُمْ صِيَاحَ الدِّيَكَةِ فَاسْأَلُوا اللَّهَ مِنْ فَضْلِهِ؛ فَإِنَّهَا رَأَتْ مَلَكاً وَإِذَا سَمِعْتُمْ نَهِيقَ الْحِمَارِ فَتَعَوَّذُوا بِاللَّهِ مِنَ الشَّيطَانِ؛ فَإِنَّهُ رَأَى شَيْطَاناً
(If you hear the crow of a rooster, ask Allah for his bounty for it has seen an angel and if you hear the braying of an ass, seek refuge in Allah for it has seen a devil.)
Source: Al-Bukhari, Muslim 4/2092.