Surah al qaf is the surah number 50 in the holy Quran. It was revealed to the prophet during the early stages of revelation when he was at Mecca. It was revealed to tell the people about the day of resurrection.
Surah Qaf also warns the disbelievers of what will happen if they don't believe in the prophet, showing theme evidence from what happened to the previous nations who denied their prophets. It is narrated that the prophet used to recite this surah in the Friday prayer and in each day of Eid.