Partnership and Agency - Section 2 Mishkat al-Masabih 2934
Arabic hadith text
وَعَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «أَدِّ الْأَمَانَةَ إِلَى مَنِ ائْتَمَنَكَ وَلَا تَخُنْ مَنْ خَانَكَ» . رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ وَالدَّارِمِيُّ
Translation
He reported the Prophet as saying, “Place trust in him who trusts you, but do not cheat him who cheats you.” Tirmidhi, Abu Dawud and Darimi transmitted it.