Surah Al-Hajj (The Pilgrimage) — Chapter 22 of the Holy Quran, a Medinan surah with 78 verses.
O people, be mindful of your Lord by carrying out what He has ordered you and desisting from what He has forbidden you. The earthquake and other horrors that will accompany the Day of Judgment are a grave matter, for which it is necessary to prepare through actions which please Allah.