ثَلاثَةٌ أَحرُفُهُ

وَواحِدٌ جَميعُهُ

Three are its letters

And one is its whole

إِن رُمتَ أَن تَعكِسَهُ

فَلَستَ تَستَطيعُهُ

If you wish to invert it

You will not be able