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.

It is reported that ʿAdī b. Ḥātim – Allāh be pleased with him – said:

You will remain upon good as long as you do not start approving of what you used to repudiate and as long as you do not repudiate what you used to know (to be right), and as long as your scholar can speak amongst you without fear.

Op. cit. ḥadīth 26.