Tafsir of Ar-Rum 30:35

أم أنزلنا عليهم سلطانا

Or have We revealed to them an authority, (means, proof).

فهو يتكلم

which speaks, (means, tells),

بما كانوا به يشركون

of that which they have been associating with Him! This is a rhetorical question intended to denounce them, for they have no such thing

وإذا أذقنا الناس رحمة فرحوا بها وإن تصبهم سيية بما قدمت أيديهم إذا هم يقنطون