He is talking about Yehuborim, Muslims and Christians. I've left the full quote below::
"The books of Yehuborim, Christians and Muslims, as of those who are without, accept in a sense, i.e., so far as they agree with and conform to my statutes. Whatsoever is contrary to these, they have altered; do not accept it. Three things are against me and I hate three things. But those who keep my secrets shall receive the fulfillment of my promises. Those who suffer for my sake I will surely reward in one of the worlds."
—Satan