Narrated by Sayyiduna Abu Huraira (may Allah be pleased with him) from the Noble Prophet (peace and blessings of Allah be upon him) that he (peace be upon him) said: "It is not permissible for a woman to ask her husband to divorce her sister (co-wife), so that she may pour out her share of the cup herself; this cannot be, she will get only what is destined for her."