Q: Is there a Hadith "Live like brothers and deal like strangers"?

Q: Should one repeat the words of iqamat also and what is the virtue of repeating the words of the Azaan and iqaamat?

Q: The word Muhammad comes in the Quran 4 times. Can you tell me where it comes and the reasons, as I have heard that there is a reason for each time.

Q: Is it makrooh tanzeeehi or tahreemi to pluck the white or grey hair from the beard or hair?

Q:

1. How the khilal of the beard is done during wudhu?
2. How many times should the khilal be done according to the Sunnah?

Q: Can Zakaat be given to non-muslims?

Q: If the imam is beardless, will the people be sinful if they remain quiet?

Q: What do the four madhabs say regarding the permissibility or impermissibility of a person performing Hajj on behalf of someone else before that person has done Hajj for himself?

Q: Can you please name me some books for children's tarbiyah?

Q: 

1. My question is that after intercourse I wipe myself. If some sperm gets on my hand I wipe it with a tissue then put my qamees on. Is my qamees paak or do I have to wash my hands before touching anything.
2. If something is najis. Do you have to wash it 3 times and squeeze each time or until there is no sign of najasaat?