41. Covenants (Promises) must be fulfilled.

Surah No. 5, Al Maaeda, part of Ayat No. 1

يَا أَيُّهَا الَّذِينَ آمَنُواْ أَوْفُواْ بِالْعُقُودِ

Translation :

O you who believe! Fulfill (your) obligations.

Surah No. 17, Al Isra (Bani Israil), Part of Ayat No. 34

o وَأَوْفُواْ بِالْعَهْدِ إِنَّ الْعَهْدَ كَانَ مَسْؤُولاً

Translation :

And fulfil (every) covenant (Promise). Verily! the covenant will be enquired (On the day of Judgment)