Narrated Abu Hurairah (May Allah be
pleased with him):
Allah's Messenger (sallallahu 'alayhi wa
sallam) said,
"The one who calls to true guidance will
have a reward like the rewards of those
who follow him without that detracting
from their rewards in the slightest, and the
one who calls to misguidance will have a
burden of sin like that of those who follow
him, without that detracting from their
burden of sin in the slightest."
Muslim 4831.