This sūrah of 88 verses derives its name from the abbreviated or single letter sād in the first verse. It was revealed in the mid-Makkan period of Islam, after the conversion of ‘Umar ibn al-Khattāb, may God be pleased with him. It warns those who oppose the preaching of the Messenger, upon him be peace and blessings. It calls for obedience to the Messenger, and gives examples from the experiences of earlier Messengers.
Sad. (I swear) by the glorious Qur’an bearing the Reminder (with guidance to the truth and warning, that you are one who has been sent to convey God’s Religion).