5th Ayah from Surah Al Muzzammil
Indeed, We will cast upon you a heavy word.
We shall send a momentous message down to you.
Verily, We shall send down to you a weighty Word (i.e. obligations, legal laws, etc.).
We are going to send down to you a weighty discourse.
For we shall charge thee with a word of weight.
Soon shall We send down to thee a weighty Message.