Bow down in prayers..

Surah Al-Mursalat, Verse 48: وَإِذَا قِيلَ لَهُمُ ارْكَعُوا لَا يَرْكَعُونَ And when it is said to them: "Bow down yourself (in prayer)!" They bow not down (offer not their prayers). (English - Mohsin Khan) via iQuran