Bahz bin Hakim narrated from his father that his grandfather said:

"If something was brought to him, the prophet would ask whether it was a gift or charity. If it was said that if was charity, he would not eat, and if it was said that it was a gift, he would stretch forth his hand."

أَخْبَرَنَا زِيَادُ بْنُ أَيُّوبَ، قَالَ حَدَّثَنَا عَبْدُ الْوَاحِدِ بْنُ وَاصِلٍ، قَالَ حَدَّثَنَا بَهْزُ بْنُ حَكِيمٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ كَانَ النَّبِيُّ ﷺ إِذَا أُتِيَ بِشَىْءٍ سَأَلَ عَنْهُ " أَهَدِيَّةٌ أَمْ صَدَقَةٌ " . فَإِنْ قِيلَ صَدَقَةٌ لَمْ يَأْكُلْ وَإِنْ قِيلَ هَدِيَّةٌ بَسَطَ يَدَهُ .