Musnad Ahmad 30:3425

Yazid narrated to us, Sufyan ibn Husayn informed us, he said: I heard al-Hasan narrating from Abu Hurayrah, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever initiates a path of misguidance and is followed in it, he shall have the like of their burdens, without that diminishing anything from their burdens. And whoever initiates a path of guidance and is followed in it, he shall have the like of their rewards, without that diminishing anything from their rewards."