Consolation to the Prophet in the face of rejection

قُلْ كَفَىٰ بِٱللَّهِ شَهِيدًۢا بَيْنِى وَبَيْنَكُمْ ۚ إِنَّهُۥ كَانَ بِعِبَادِهِۦ خَبِيرًۢا بَصِيرًا

Say, "Sufficient is Allāh as Witness between me and you. Indeed He is ever, concerning His servants, Aware and Seeing."