The ruling on a new Muslim husband marrying his wife’s Muslim sister.

Question:

A husband has converted from Christianity to Islam, but his wife remains Christian and has not converted. Can the new Muslim husband marry his Christian wife’s Muslim sister?

Answer:

If a Christian man converts to Islam, his marriage to a Christian woman remains valid; therefore, he cannot marry his Christian wife’s Muslim sister, as it is not permissible to have two sisters in one marriage. The command of Allah is:

﴿وَأَنْ تَجْمَعُوا بَيْنَ الْأُخْتَيْنِ﴾

“And you are forbidden to marry two sisters together.”