ذٰلِكَ أَدنىٰ أَن يَأتوا بِالشَّهادَةِ عَلىٰ وَجهِها أَو يَخافوا أَن تُرَدَّ أَيمانٌ بَعدَ أَيمانِهِم ۗ وَاتَّقُوا اللَّهَ وَاسمَعوا ۗ وَاللَّهُ لا يَهدِي القَومَ الفاسِقينَ

That is more likely that they will give testimony according to its [true] objective, or [at least] they would fear that [other] oaths might be taken after their oaths. And fear Allah and listen; and Allah does not guide the defiantly disobedient people.