Surah Al-Waqi'ah — Ayah 76 (56:76)
وَإِنَّهُۥ لَقَسَمٞ لَّوۡ تَعۡلَمُونَ عَظِيمٌ ٧٦
English translation (Saheeh International)
And indeed, it is an oath - if you could know - [most] great.
Brief commentary
And indeed, taking an oath of these orbits is a great thing - if only you were to understand its greatness-, because there are uncountable signs and lessons in it.