Al-Bayhaqi reported: Abdullah ibn Mas’ud, may Allah be pleased with him, said, “Whoever wishes for himself to be fair with people, let him treat people as he would love to be treated.”
Source: Shu’ab al-Imān 10375
عن البيهقي قَالَ عَبْدُ اللَّهِ بْنُ مَسْعُودٍ رضي الله عنه مَنْ أَحَبَّ أَنْ يُنْصِفَ النَّاسَ مِنْ نَفْسِهِ فَلْيَأْتِ إِلَى النَّاسِ مَا يُحِبُّ أَنْ يُؤْتَى إِلَيْهِ
10375 شعب الإيمان للبيهقي السابع والسبعون من شعب الإيمان