- Is it permissible to perform the prostration of forgetfulness (sujud al-sahw) for various errors in prayer, and how and when is it performed? Is there a specific prostration of forgetfulness for each error, especially when the errors are not precisely identified? - Can cats hear the voices of those being tormented in their graves, and is this the reason for their frowns?

Cats hear the sounds of those tormented in the graves near them because they are animals and fall under the general category of creatures that hear the torment of the grave, with the exception of humans and jinn. This is mentioned in the Prophet’s (peace be upon him) hadith (definition): "He will let out a scream that is heard by everyone near him except for the two weighty ones (humans and jinn)," and his saying: "Indeed, they are being tormented in their graves with a torment that is heard by animals." As for their scowling, there is no religious evidence for it.