"And to Him belongs the religion (ad-din) perpetually [wasiban]," meaning: permanently. "Do you then fear other than Allah?" meaning: Do you worship [others]? He is saying this to the polytheists in the form of an inquiry, meaning: You have indeed done so, and thus you worshipped idols instead of Him.
﴿وَله الدّين واصبا﴾ أَيْ: دَائِمًا ﴿أَفَغَيْرَ اللَّهِ تَتَّقُونَ﴾ تَعْبُدُونَ؛ يَقُولُ هَذَا لِلْمُشْرِكِينَ عَلَى الاسْتِفْهَامِ؛ أَيْ: قَدْ فَعَلْتُمْ، فَعَبَدْتُمُ الْأَوْثَان من دونه.