There is no god but I; therefore worship and serve Me.

Not a messenger did We send before thee without this inspiration sent by Us to him: that there is no god but I; therefore worship and serve Me. (25)


Quran: Sura Al-Anbiya(21), Verse 25.

Warn (Man) that there is no god but I: so do your duty unto Me

He doth send down His angels with inspiration of His Command, to such of His servants as He pleaseth, (saying): "Warn (Man) that there is no god but I: so do your duty unto Me." (2)


-
Quran: Sura An-Nahl (16), Verse 2.