Say, "Sufficient is Allah as Witness between me and you. Indeed he is ever, concerning His servants, Acquainted and Seeing."
The Saheeh International Quran Translation
قُلْ كَفَىٰ بِٱللَّهِ شَهِيدًۢا بَيْنِى وَبَيْنَكُمْ إِنَّهُۥ كَانَ بِعِبَادِهِۦ خَبِيرًۢا بَصِيرًاSay, "Sufficient is Allah as Witness between me and you. Indeed he is ever, concerning His servants, Acquainted and Seeing."