Reference: Al-Fulaani in Eeqaaz al-Himam p50, tracing it to Imaam Muhammad and then saying:
This does not apply to the mujtahid, for he is not bound to their views anyway, but it applies to the muqallid.
said:
When I say something contradicting the Book of Allaah سبحانه و تعالى or what is narrated from the Messenger ﷺ, then ignore my saying.
