Details of Al-Li`an Allah says:وَالَّذِينَ يَرْمُونَ أَزْوَاجَهُمْ وَلَمْ يَكُن لَّهُمْ شُهَدَاء إِلاَّ أَنفُسُهُمْ فَشَهَادَةُ أَحَدِهِمْ أَرْبَعُ شَهَادَاتٍ بِاللَّهِAnd for those who accuse their wives, but have no witnesses except themselves, let the testimony of one of them be four testimonies by Allah,This Ayah offers a way out for husbands. If a husband has accused his wife but cannot come up with proof, he can swear the Li`an (the oath of condemnation) as Allah commanded.This means that he brings her before the Imam and states what he is accusing her of. The ruler then asks him to swear four times by Allah in front of four witnesses,إِنَّهُ لَمِنَ الصَّادِقِينَthat he is one of those who speak the truth.in his accusation of her adultery.وَالْخَامِسَةُ أَنَّ لَعْنَتَ اللَّهِ عَلَيْهِ إِن كَانَ مِنَ الْكَاذِبِينَ