17. So glorify Allâh [above all that (evil) they associate with Him (O believers)] when you come up to the evening [i.e. offer the (Maghrib ) sunset and (‘Ishâ’) night prayers], and when you enter the morning [i.e. offer the (Fajr) morning prayer].

     18. And His are all the praises and thanks in the heavens and the earth; and (glorify Him) in the afternoon (i.e. offer ‘Asr prayer) and when you come up to the time, when the day begins to decline (i.e. offer Zuhr prayer). (Ibn ‘Abbâs said: “These are the five compulsory congregational prayers mentioned in the Qur’ân).” [Tafsir At-Tabari]

Surah Ar-Rûm