﴿ فَكَفَىٰ بِٱللَّهِ شَهِيدًۢا بَيْنَنَا وَبَيْنَكُمْ إِن كُنَّا عَنْ عِبَادَتِكُمْ لَغَٰفِلِينَ ﴾

“and none can bear witness between us and you as God does: we were, for certain, unaware of your worshipping [us].”

God suffices as a witness between us and you that indeed in is softened so read as innā we were unaware of your worship’.