«Verily, the number of months with Allaah is twelve months (in a year), so it was ordained by Allaah on the Day when He created the heavens and the earth; of them, four are sacred. That is the right religion, so wrong not yourselves therein…» ... [ Read Explanation ]

[ Al-Tawbah - 9:36]

"Nay, by Allah, you have to enjoin the good and forbid the wrong, and restrain the hand of the tyrant, and to force him on the truth and to confine him to the truth, otherwise Allah will be about to strike the hearts of some of you against others, then He will curse you as He cursed them" ... [ Read Explanation ]

Reported by Abu Dawud and Tirmidhi