The first clear mention of endless misery is to be found in a work from 155 to 165 AD by Tatian.[18] According to theologian Edward Beecher, in the first four centuries there were six main theological schools and only one of them advocated the idea of eternal hell.
expanding on this, even the existence of eternal hell is fairly controversial among theologians. this is from the page on [Christian Univeralism]:(https://en.m.wikipedia.org/wiki/Christian_universalism)