وَإِن جَـٰدَلُوكَ فَقُلِ ٱللَّهُ أَعْلَمُ بِمَا تَعْمَلُونَ
Wa in jaadalooka faqulil laahu a'lamu bimaa ta'maloon
and if they argue with you, say, ‘God is well aware of what you are doing.’
And if they dispute with you, say, "God knows best what you are doing.