This hadeeth comes under the following chapter: PERTAINING TO ONE WHO INTRODUCED SOMETHING GOOD OR EVIL, OR HE WHO CALLED TO RIGHTEOUSNESS OR TO THE PATH OF ERROR
Abu Huraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: He who called (people) to righteousness, there would be reward (assured) for him like the rewards of those who adhered to it, without their rewards being diminished in any respect. And he who called (people) to error, he shall have to carry (the burden) of its sin, like those who committed it, without their sins being diminished in any respect.