Hawzah News Agency – Imam Baqir peace be upon him syas:

ثَلاثٌ لَم يَجعَلِ اللَّهُ عَزَّوجلَّ لِأحَدٍ فيهِنَّ رُخصَةً: ... الوَفاءُ بِالعَهدِ لِلبَرِّ والفاجِرِ.

 ‘There are three things wherein Allah, Mighty and Exalted, has not granted anyone a concession … the fulfilment of one’s promise, be it to the good person or the bad.’

Source: al-Kafi, v. 2, p. 162, no. 15