It was narrated that Sa’eed bin al-Musayyah said:I asked Sa"d bin Abi Waqqas about tiyarah and he rebuked me and said: Who told you about that? I did not like to tell him who told me. He said: The Messenger of Allah (ﷺ) said:

“There is no "adwa [contagion, transmission of infectious disease without the permission of Allah], no tiyarah [superstitious belief in bird omens] and no ham [refers to a Jahili Arab tradition described variously as: a worm which infests the grave of a murder victim until he is avenged; an owl, or the bones of a dead person turned into a bird that could fly]. If there were any (omen), it would be in a woman, a horse or a house. And if you hear of the plague in a land, do not go there, and if it is in the land where you are, do not flee from it.”