"Guard strictly your prayers, especially the Middle Prayer; and stand before Allah in a devout (frame of mind)."(Surah Al-Baqarah: 238)
When Allah Subhanahu wa Ta'ala spoke directly to Moses Alaihe Salam, He said:"And I have chosen you, so listen to that which is inspired to you. Verily, I am Allah! There is none worthy of worship but I, so worship Me and offer prayer perfectly for My remembrance." (Taha 13-14)