Hadith is about Breaking Covenants

Abu Sa`id Al-Khudri RA said: The Prophet (sallallaahu ’alayhi wa sallam) said, "Every one who breaks a covenant will have a flag by his buttocks on the Day of Resurrection. It will be raised higher according to the nature of his breach. Behold, there will be no greater a sin with respect to breaking the covenant than that of a ruler who breaks his covenant with the Muslim masses." (Muslim)