AZ ZUMAR (ROMBONGAN-ROMBONGAN) — Ayat 15
فَاعْبُدُوا مَا شِئْتُم مِّن دُونِهِ قُلْ إِنَّ الْخَاسِرِينَ الَّذِينَ خَسِرُوا أَنفُسَهُمْ وَأَهْلِيهِمْ يَوْمَ الْقِيَامَةِ أَلَا ذَلِكَ هُوَ الْخُسْرَانُ الْمُبِينُ
So worship what you will besides Him." Say, "Indeed, the losers are the ones who will lose themselves and their families on the Day of Resurrection. Unquestionably, that is the manifest loss."
Tafsir
{So worship whatever you wish besides Him} other than Him. This is a threat to them and a warning that they do not worship God Almighty. {Say, “Indeed, the losers are those who will lose themselves and their families on the Day of Resurrection”} by their souls being eternally in Hell and not reaching the houris prepared for them in Paradise if they had believed. {Unquestionably, that is the manifest loss.} The clear one.