Surah Al-Mai'dah (The Spread Table), Verse 108

ذٰلِكَ اَدْنٰۤی اَنْ یَّاْتُوْا بِالشَّهَادَةِ عَلٰی وَجْهِهَاۤ اَوْ یَخَافُوْۤا اَنْ تُرَدَّ اَیْمَانٌ بَعْدَ اَیْمَانِهِمْ وَاتَّقُوا اللّٰهَ وَاسْمَعُوْا وَاللّٰهُ لَا یَهْدِی الْقَوْمَ الْفٰسِقِیْنَ 

Zaalika adnaaa ai ya'too bishshahaadati 'alaa wajhihaaa aw yakhaafooo an turadda aimaanum ba'da aimaanihim; wattaqul laaha wasma'oo; wallaahu laa yahdil qawmal faasiqeen

“That is most suitable: that they may give the evidence in its true nature and shape, or else they would fear that other oaths would be taken after their oaths. But fear Allah, and listen (to His counsel): for Allah guideth not a rebellious people:”

Quran 5:108 (Yusuf Ali Translation)