Is it permissible to perform congregational prayer with a Shiite person, or is it obligatory to pray individually, based on the saying that a Shiite is not a Muslim?

If a Shiite believes in the corrupt doctrines of the Shiites, such as declaring the Companions to be disbelievers and hating Abu Bakr and Umar, then the truth should be explained to him. If he recants, he may pray with you; otherwise, it is not permissible for him to pray with you. However, if he believes himself to be Shiite but does not hold their doctrines of disbelief, and he loves Abu Bakr and Umar, and is pleased with the Companions, then he may pray with you, and he is not to be judged as a disbeliever.