consequences of broken promises

فَلَمَّا كَشَفْنَا عَنْهُمُ ٱلرِّجْزَ إِلَىٰٓ أَجَلٍ هُم بَـٰلِغُوهُ إِذَا هُمْ يَنكُثُونَ

But when We removed the punishment from them until a term which they were to reach, then at once they broke their word.