٧٣ : ٥
إِنَّا سَنُلۡقِي عَلَيۡكَ قَوۡلٗا ثَقِيلًا
Indeed, We will cast upon you a heavy word.
شرح ومعانٍ · ١
- i.e., the revelation, which when descending on the Prophet (ﷺ) bore down upon him with a great weight. Another meaning is "important ordinances."