Want to break up this partnership

A: If a person knows that these companies which sell their shares and deal in usury, it will not be permissible for him to buy their shares or to deal with them. (Part No. 14; Page No. 337) As for those who do not know anything about their dealings, it is permissible for him to deal with them in the Islamic way. However, it will be better for him to check and ask about these companies. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.