Hisnul Muslim

Supplication said upon hearing a rooster crow or the braying of an ass

أَعـوذُ بِاللهِ مِنَ الشَّيْـطانِ الرَّجيـم

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.