Q: Is it permissible for one to marry his divorced wife’s sister while his divorced wife is in iddat?

Q: Is it permissible for a person to marry two sisters at the same time?

Q: How many witnesses are required for the nikaah to be valid?

Q: Which women are declared haraam for a man to marry?

Q: What are the Shar’ee requirements for the nikaah to be valid?

Q: Is it advisable for one who has the need to get married to delay on account of studying further?

Q: I once read a hadith; something to this effect that if you talk during azaan, on the day of qiyamat you will not be able to recite your kalima. Can you please quote me the exact Hadith?

Q: Please enlighten me with the references of this hadith: Conjoined Hadiths from Musnad Ahmad: Jaabir (radhi-yallaahu 'anhu) narrated that Allaah's Messenger (sal-Allaahu`alayhe wa sallam) said: "Al Muslimoon Ummatun Wahida, Wa Biladahum Wahida, Wa Harbahum Wahida, Wa Salmahum Wahida". Is this a Hadith at all?

Q:

1. I read that no one will enter jannah unless they have perfect imaan. So if a person has Imaan but it is not perfect will he attain jannah? Quote hadith or quraan ayaats if possible.
2. What is perfect imaan? If I commit a sin does it mean I do not have perfect imaan ?
3. Can you send me the hadith which says how one can attain perfect imaan through salaam?

Q: Is the following hadith authentic and in the proper wording ?

Umm Habibah bint Abu Sufyan reports that the Messenger of Allah (Sallaho Alaihe Wassallam) said: "Whoever prays twelve rak'at during the day and night will have a house built for him in paradise: four rak'at before zuhr and two after it, two rak'at after maghrib, two rak'at after 'isha, and two rak'at before fajr." (Tirmidhi, who graded it as Hasan sahih).

Can you send me any more hadith that says how to get a house in jannah?