Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works? And then will I profess unto them, I never knew you: depart from me, ye that work iniquity. (Matthew 7:22-23 KJV)
Even today, we see that some pastors misuse the name of Jesus for their own personal gain. There is a televangelist who sells a cloth for healing over the body for $25 or more. It's just a cloth and there is no power in the cloth, except the power when we speak over it in the name of Jesus. We cannot receive any credit when the people receive healing, except God. John 9:2-3 declares, "And his disciples asked him, saying, Master, who did sin, this man, or his parents, that he was born blind? Jesus answered, Neither hath this man sinned, nor his parents: but that the works of God should be made manifest in him."