Which was revealed in Makkah

How `Amr bin Al-`As was aware of the Qur'an's Miracle due to this Surah

They have mentioned that `Amr bin Al-`As went to visit Musaylimah Al-Kadhdhab after the Messenger of Allah ﷺ was commissioned (as a Prophet) and before `Amr had accepted Islam. Upon his arrival, Musaylimah said to him, "What has been revealed to your friend (Muhammad ﷺ ) during this time" `Amr said, "A short and concise Surah has been revealed to him." Musaylimah then said, "What is it" `Amr replied;

Virtue of [ Studying ] Surah al-` Asr

Sayyidna ` Ubaidullah Ibn Hisn ؓ reports that whenever two Companions of the Holy Prophet ﷺ met, they would not part company until one of them had recited Surah Al-` Asr in its entirety to the other. [ Transmitted by At-Tabarni ]. Imam Shafi` i (رح) says that if people thought about Surah Al-` Asr carefully, it would be enough for their guidance. It is a concise but comprehensive Surah, which in three verses, outlines a complete way of human life based on the Islamic worldview.