In order to separate¬† flocks of sheep, the shepherds will each call out: Tahoo! Tahoo! or a similar call. The sheep lift their heads, and start to follow their own shepherd. They recognise their own shepherd’s tone of voice. Strangers have often used the same call but their attempts to get the sheep to follow them always fail. The words of Jesus are indeed true ‚Ķ when He said: “The sheep follow him, for they know his voice. A stranger they will not follow, but they will flee from him. for they do not know the voice of strangers.” (John 10:4-5)

From: Manners and Customs of Bible Times

Fred H. Wight