How can a mute butcher say "Bismillah" over the animal in the slaughterhouse?

The scholars have unanimously agreed on the permissibility of the slaughter of a mute person. His اشاره to the sky stands in place of the utterance of a speaking person, indicating his intention to pronounce the name of Allah. They derive this from the hadith of the slave girl, whose faith the Messenger ruled to be sound because of her اشاره to the sky. If the mute person makes a gesture that indicates the pronouncement of the name of Allah, and this is understood, then it is sufficient.