Mutarrif bin Abdullah (may Allah have mercy on him) said: Sayyiduna Imran bin Husayn (may Allah be pleased with him) said to me: We performed tamattu' twice with the Messenger of Allah (peace and blessings be upon him). A man said, from his own opinion, whatever he wished.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15343