فَمَن خافَ مِن موصٍ جَنَفًا أَو إِثمًا فَأَصلَحَ بَينَهُم فَلا إِثمَ عَلَيهِ ۚ إِنَّ اللَّهَ غَفورٌ رَحيمٌ

If one fears wrongdoing or bias from a testator and mediates peace among them, he does not sin. God is Forgiving and Merciful.