Al-Asr (Arabic: العصر, romanized: al-ʻaṣr, The Declining Day, Eventide, The Epoch, Time) is the 103rd chapter (sūrah) of the Qur’ān, the Muslim holy book.

³ ’il-la l-lazīna ’āmanū wa‘amilu ṣ-ṣāliḥāti watawāṣaw bilḥaq-qi watawāṣaw biṣ-ṣabr(i) 1 By Al-'Asr (the time).

3 Except those who believe (in Islamic Monotheism) and do righteous good deeds, and recommend one another to the truth (i.e. order one another to perform all kinds of good deeds (Al-Ma'ruf) which Allah has ordained, and abstain from all kinds of sins and evil deeds (Al-Munkar) which Allah has forbidden), and recommend one another to patience (for the sufferings, harms, and injuries which one may encounter in Allah's Cause during preaching His religion of Islamic Monotheism or Jihad, etc.

3 Except such as have Faith, and do righteous deeds, and (join together) in the mutual teaching of Truth, and of Patience and Constancy.

Regarding the timing and contextual background of the revelation (asbāb al-nuzūl), it is an earlier "Meccan surah", which means it is believed to have been revealed in Mecca, instead of later in Medina.

According to some, it follows sūrah 94 in the chronological order of the Quran.

[8] This sura teaches that all human beings are in loss, except those who have iman (faith in Islam), do righteous deeds and remind others of the Haqq (truth, rights, reality) and remind others of Sabr (patience).

This sura is considered the summary of whole Quran by almost all notable classical and modern Islamic scholars including Imam Shafi, Ibn Kathir, Israr Ahmed and Farhat Hashmi.