Husband and wife
    converted together; do they need to do a new marriage contract?
Question

                Some Muslims made da’wah to call a
      family, consisting of a husband and wife, to Islam. They embraced Islam and came together
      to the Islamic centre to declare their Islam. Do they have to do a new marriage contract
      or not?
Praise be to Allah.Ibn Qudaamah (may Allaah have mercy on him) said:
“Chapter Three: if the husband and wife become Muslim together,
    then they keep their original marriage contract, whether this happens before the marriage
    is consummated or after. There is no dispute among the scholars on this matter, praise be
    to Allaah.
Ibn ‘Abd al-Barr mentioned that there is scholarly consensus on
    the matter. The reason is that there is no difference of religion between the spouses. Abu
    Dawood reported from Ibn ‘Abbaas that a man came to declare his Islam at the time of
    the Messenger of Allaah 
 (peace and blessings of Allaah be upon him), then his wife came
    to declare her Islam. [The man] said: ‘O Messenger of Allaah, she became Muslim when
    I did.’ So the Prophet 
 (peace and blessings of Allaah be upon him) returned her to
    him.”
(al-Mughni, part 7, Ahkaam al-Nikaah).
On the basis of the above, their original marriage contract is
    sufficient, and there is no need for them to do a new one. And Allaah knows best.