Imam Sadiq (a.s) said: “After you are granted permission to enter a house, greet first (by saying one of the names of God). You must ask permission to enter from outside the door where you cannot see anything inside since you are ordered to seek permission to enter just for what you might see. You must seek permission to enter three times. Enter whenever they granted permission, but return immediately if they ask you to return. The first time is to let the residents of the house hear your request. The second request is to let them cover up their body to meet the veiling requirements, and the third request is to give them a chance to grant permission to enter or deny it. If they do not grant permission to enter, you must immediately return.”