Reports concerning the prohibition of praying behind the Qadariyyah (deniers of divine decree), marrying into them, eating animals slaughtered by them, and rejecting their testimony:

It is reported from Wathilah ibn al-Asqa that he ordered the prayer performed behind the Qadariyyah to be repeated and forbade following them in prayer. Among the Successors:

1344 — It is reported from Ali ibn Abd Allah ibn al-Abbas that he used to say, “If the imam is a follower of heretical inclinations, then one should not pray behind him.” It is also reported from Muhammad ibn Ali ibn al-Husayn that he ordered the prayer performed behind a Qadari to be repeated. Sayyar Abu al-Hakam said, “One should not pray behind the Qadariyyah; if one prays behind any one of them, he must repeat the prayer.”

1345 — It is also reported from Ayyub al-Sakhtiyani likewise.