فَلَا تَدْعُ مَعَ ٱللَّهِ إِلَٰهًا ءَاخَرَ فَتَكُونَ مِنَ ٱلْمُعَذَّبِينَ
How to read it
Falā tad'ʻu maʻa -llahi 'ilāhan 'ākhara fatakūna mina l-muʻadhdhabīna
So call not on any other god with Allah, or thou wilt be among those under the Penalty.
Translation: Abdullah Yusuf Ali

