Surah Ar-Ra'd, ayah 20

ٱلَّذِينَ يُوفُونَ بِعَهۡدِ ٱللَّهِ وَلَا يَنقُضُونَ ٱلۡمِيثَٰقَ ٢٠

Alladhīna yūfūna bi'ahdillāhi walā yanqudūnal-mīthāq

Those who fulfill the covenant of Allāh and do not break the contract,