[1779] i.e., the revelation, which when descending on the Prophet (ﷺ) bore down upon him with a great weight. Another meaning is "important ordinances."
Verse 5 of Surah Al-Muzzammil (73:5), a Meccan surah, is in juz 29, on page 574 of the mushaf. Read it in Arabic with its transliteration, translations and tafsir, and listen to it recited by 74 reciters.
Listen to verse 5 of Surah Al-Muzzammil
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Tafsir of verse 5
Al-Mukhtasar
I am going to send down on you, O Messenger, the Qur’ān, which is a heavy word, due to the obligations, limits, provisions, etiquettes etc. that it contains.
[2] i.e., the revelation, which the Prophet (ﷺ) would feel its great weight when descending upon him. Also, it is heavy for its ordinances, rulings, punishments, ethics, etc.
Verily, We shall send down to you a weighty Word (i.e. obligations, laws).
For we shall charge thee with a word of weight.
Soon shall We send down to thee a weighty Message.
Surely We will make to light upon you a weighty Word.
Surely We will soon cast upon you a weighty Saying.