Tafseer Ibn Kathir of AL MUNAAFIQUUN [2]

اتَّخَذُوا أَيْمَانَهُمْ جُنَّةً فَصَدُّوا عَن سَبِيلِ اللَّهِ إِنَّهُمْ سَاء مَا كَانُوا يَعْمَلُونَ

They have taken their oaths as a cover, so they averted [people] from the way of Allah . Indeed, it was evil that they were doing.