The Prophet (may Allah's peace and blessings be upon him) warned against Tiyarah, which is regarding something, audible or visible, as a bad omen whether it is from birds, animals, people with deformities, numbers, days, etc. He mentioned the "Tayr" (bird) in specific because it was commonly known during the pre-Islamic era of ignorance, as a bird would be urged to fly when someone intended to do something like travel, trade, or anything else. If the bird flew to the right, he would take this as a good omen and proceed with what he intended, whereas if the bird flew to the left, he would take this as a bad omen and refrain from doing what he intended. He informed us that it is Shirk. In fact, belief in bad omens is Shirk because none can bring goodness except Allah and none can ward off evil except Allah, alone with no partner. Ibn Mas‘ūd (may Allah be pleased with him) mentioned that a Muslim may feel in his heart something of this pessimism; however, he must dispel it with reliance on Allah along with utilizing the available means.