Yes we do. Christ Himself taught that there would be a place of punishment for unrepentant sinners in Lu. 16:19-26; here Jesus taught that it was a place of continuous torment and fire and that no one could leave once they have arrived. Jesus also warned all in Mt. 5:29,30 that we should avoid being condemned to Hell at any cost. In Mk. 9:43,44, Jesus tells us that in Hell, "the fire shall never be quenched" and of those sent to Hell, "their worm never dies." It is a place on unending torment.
In Revelation 20:10 Hell is referred to as "the lake of fire and brimstone" and we are told that the devil and false prophets will be "tormented day and night forever." Also in Revelation 20:15 we are told that, "And anyone not found written in the Book of Life was cast into the lake of fire."
Yes the Bible and the Son of God make it clear that there will be eternal punishment for those who have not repented of their sins and turned to Christ. And that is what we too, teach.