﴿ وَأَوْفُوا۟ بِعَهْدِ ٱللَّهِ إِذَا عَٰهَدتُّمْ وَلَا تَنقُضُوا۟ ٱلْأَيْمَٰنَ بَعْدَ تَوْكِيدِهَا وَقَدْ جَعَلْتُمُ ٱللَّهَ عَلَيْكُمْ كَفِيلًا ۚ إِنَّ ٱللَّهَ يَعْلَمُ مَا تَفْعَلُونَ ﴾

“And be true to your bond with God whenever you bind yourselves by a pledge, and do not break [your] oaths after having [freely] confirmed them and having called upon God to be witness to your good faith: behold, God knows all that you do.”

Please check ayah 16:92 for complete tafsir.