wisdom of Islamic law

قَدْ فَرَضَ ٱللَّهُ لَكُمْ تَحِلَّةَ أَيْمَـٰنِكُمْ ۚ وَٱللَّهُ مَوْلَىٰكُمْ ۖ وَهُوَ ٱلْعَلِيمُ ٱلْحَكِيمُ

Allāh has already ordained for you [Muslims] the dissolution of your oaths. And Allāh is your protector, and He is the Knowing, the Wise.