The name of this sūrah is derived from verse 4 where the word saff (ranks) is used in praise of the Muslims who fought in ranks, coming together as though they were a firm and solid building. This sūrah consists of 14 verses. It was revealed just before or just after the Battle of Uhud. It stresses the importance of striving hard in the cause of God after faith, and of the necessary concordance between professed belief and actual behavior.
All that is in the heavens and all that is on the earth glorifies God. He is the All-Glorious with irresistible might, the All-Wise.