Mishkat al-Masabih 6 Zakat كتاب الزكاة 5

وَعَنْ جَرِيرِ بْنِ عَبْدُ اللَّهِ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «إِذا أَتَاكُمُ الْمُصَدِّقُ فَلْيَصْدُرْ عَنْكُمْ وَهُوَ عَنْكُمْ رَاضٍ» . رَوَاهُ مُسلم

Jarir b. ‘Abdallah reported God’s messenger as saying, “When the collector of sadaqa comes to you see that he is pleased with you when he leaves you.” Muslim transmitted it.