That depends on what it is he said. Was it a big issue/wrong teaching or something small. Also pray about it when you sense something is wrong. Some are led by God to leave a church immediately when something is wrong some are led to wait. It is important that you yourself maintain a good relationship with God. For we wrestle not with flesh and blood, but we wrestle with spirits, evil powers behind people. (Eph 6:12) Pray for them.