The Quran

فَإِذا بَلَغنَ أَجَلَهُنَّ فَأَمسِكوهُنَّ بِمَعروفٍ أَو فارِقوهُنَّ بِمَعروفٍ وَأَشهِدوا ذَوَي عَدلٍ مِنكُم وَأَقيمُوا الشَّهادَةَ لِلَّهِ ۚ ذٰلِكُم يوعَظُ بِهِ مَن كانَ يُؤمِنُ بِاللَّهِ وَاليَومِ الآخِرِ ۚ وَمَن يَتَّقِ اللَّهَ يَجعَل لَهُ مَخرَجًا

Muhammad Asad

And so, when they are about to reach the end of their waiting-term, either retain them in a fair manner or part with them in a fair manner. And let two persons of [known] probity from among your own community¹ witness [what you have decided]; and do yourselves bear true witness before God:² thus are admonished all who believe in God and the Last Day. And unto everyone who is conscious of God, He [always] grants a way out [of unhappiness],

Lit., "from yourselves": i.e. persons who are sufficiently acquainted with the circumstances of the case.
Sc., that the relevant decision has not been made in a frivolous spirit.