ذَلِكَ أَدْنَى أَن يَأْتُوا بِالشَّهَادَةِ عَلَى وَجْهِهَا أَوْ يَخَافُوا أَن تُرَدَّ أَيْمَانٌ بَعْدَ أَيْمَانِهِمْ وَاتَّقُوا اللَّهَ وَاسْمَعُوا وَاللَّهُ لَا يَهْدِي الْقَوْمَ الْفَاسِقِينَ

That makes it likelier that they give the testimony in its genuine form, or fear that other oaths will be taken after their oaths. Be wary of Allah and listen, and Allah does not guide the transgressing lot.