2:283
وَ إِن كُن تُمْ عَلَىٰ سَفَرٍ وَ لَمْ تَجِدُ وا۟ كَاتِبًا فَ رِهَٰنٌ مَّقْبُوضَةٌ فَ إِنْ أَمِنَ بَعْضُ كُم بَعْضًا فَ لْ يُؤَدِّ ٱلَّذِى ٱؤْتُمِنَ أَمَٰنَتَ هُۥ وَ لْ يَتَّقِ ٱللَّهَ رَبَّ هُۥ وَ لَا تَكْتُمُ وا۟ ٱل شَّهَٰدَةَ وَ مَن يَكْتُمْ هَا فَ إِنَّ هُۥٓ ءَاثِمٌ قَلْبُ هُۥ وَ ٱللَّهُ بِ مَا تَعْمَلُ ونَ عَلِيمٌ
And if you are on a journey and cannot find a scribe, then a security deposit [should be] taken. And if one of you entrusts another, then let him who is entrusted discharge his trust [faithfully] and let him fear Allah, his Lord. And do not conceal testimony, for whoever conceals it - his heart is indeed sinful, and Allah is Knowing of what you do.