Among the Behavior of the Idolators was vowing to Things that Allah had provided for Them to their gods

Allah tells us about some of the heinous deeds of those who used to perform baseless worship of other gods besides Him, such as idols and statues, with no grounds for doing so. They gave their idols a share of that which Allah had provided for them,

فَقَالُواْ هَـذَا لِلَّهِ بِزَعْمِهِمْ وَهَـذَا لِشُرَكَآئِنَا فَمَا كَانَ لِشُرَكَآئِهِمْ فَلاَ يَصِلُ إِلَى اللَّهِ وَمَا كَانَ لِلَّهِ فَهُوَ يَصِلُ إِلَى شُرَكَآئِهِمْ سَآءَ مَا يَحْكُمُونَ

Even the Punishment of the World is Mercy in Disguise

In the verses cited above, after having mentioned various punishments which could seize disbelievers within this world, it was said in the end: فَإِنَّ رَ‌بَّكُمْ لَرَ‌ءُوفٌ رَّ‌حِيمٌ (So, indeed your Lord is Very Kind Very Merciful).