Is it permissible to knock on the door more than three times, and what is the method for knocking three times?

The questioner : Knocking on the door, I mean knocking on the door of the house, do you want to reach it?

The Shaykh : The house was stolen.

The questioner : Yes, do you count one or three? Three. No, some people knock like this, as if it were one, then like this, as if it were one, up to three, meaning when they get to three, they knock nine times in a row.

The Shaykh : I mean, you want each knock to be separate from the next one.

The questioner : Just like this, he might not hear it, then a second time, meaning the owner of the house might be almost deaf, meaning he might be

The Shaykh : My dear.

The questioner : Some people, I mean, have poor hearing, so is it delayed?

The Shaykh : If the owner of the house has heavy hearing, it appears that the one seeking permission should knock on the door until he knows that he is not there,

The questioner : Hello, my dear.

The Shaykh : It has no limits, as I said.

The questioner : Okay, if we proceed with knocking on the door like this, meaning.

The Shaykh : Yes.

The questioner : Then this itself is one, then a second time, three numbers.

The Shaykh : I think this is according to custom; people now have bells, and since electricity became available, people seek permission with the bell,