Is it permissible for a person to partner with another person in trade, when the latter has transactions involving riba (usury or interest)?

The questioner : Is it permissible for a Muslim to partner with a person in trade, when this person may have some transactions involving riba (usury or interest)? How is this situation?

The Shaykh : I think the answer is understood from what came before, in which there was a fatwa (a scholarly legal ruling) and a call to taqwa (mindfulness of Allah). It is permissible as long as his wealth is not entirely riba (usury or interest) and as long as the partnership is not based on a riba (usury or interest) foundation. However, the path of taqwa (mindfulness of Allah) is to avoid cooperating with this person, even in a project that is permissible by the Shari'ah (Islamic sacred law).