Changing Colours

It is reported that Ḥudhayfah b. Al-Yamān – Allāh be pleased with him – said:

True misguidance is that you approve now what you used to repudiate before (because it was wrong) and repudiate now what you used to approve before; and be aware of changing colours in the religion, for the religion of Allāh is one.

Ibn Baṭṭah, Al-Ibānatu Al-Kubrā ḥadīth 25, and others.