Prophethood and Responsibility

مَّا عَلَى ٱلرَّسُولِ إِلَّا ٱلْبَلَـٰغُ ۗ وَٱللَّهُ يَعْلَمُ مَا تُبْدُونَ وَمَا تَكْتُمُونَ

Not upon the Messenger is [responsibility] except [for] notification. And Allāh knows whatever you reveal and whatever you conceal.

إِنَّا سَنُلْقِى عَلَيْكَ قَوْلًا ثَقِيلًا

Indeed, We will cast upon you a heavy word.