Whenever a meal was brought to Messenger of Allah ﷺ, he would ask whether it was a gift or Sadaqa (something given in charity). If he was told that it was Sadaqa, he would tell his companions to eat it, but if it was a gift, he would hurry to share it with them. (Using translation from Bukhārī 2576)   

كَانَ رَسُولُ اللهِ ﷺ إِذَا أُتِيَ بِطَعَامٍ سَأَلَ أَهَدِيَّةٌ هُوَ أَمْ صَدَقَةٌ؟ فَإِنْ قِيلَ صَدَقَةٌ قَالَ لِأَصْحَابِهِ كُلُوا وَلَمْ يَأَكُلْ وَإِنْ قِيلَ هَدِيَّةٌ ضَرَبَ بِيَدِهِ فَأَكَلَ مَعَهُمْ  

Whenever the Messenger of Allah ﷺ was presented with food, he asked about it, If he was told that it was a gift, he ate out of that, and if he was told that it was a sadaqa he did not eat out of that. (Using translation from Muslim 1077)   

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا أُتِيَ بِطَعَامٍ سَأَلَ عَنْهُ فَإِنْ قِيلَ هَدِيَّةٌ أَكَلَ مِنْهَا وَإِنْ قِيلَ صَدَقَةٌ لَمْ يَأَكُلْ مِنْهَا  

[Machine] I came to the Messenger of Allah ﷺ with a handful of bread and meat, and he asked, "What is this, O Salman?" I said, "It is charity." He did not eat and said to his companions, "Eat." Then I came to him with another handful of bread and meat, and he asked, "What is this, O Salman?" I said, "It is a gift." He ate and said, "We eat gifts, but we do not eat charity."  

أَتَيْتُ رَسُولَ اللهِ ﷺ بِجَفْنَةٍ مِنْ خُبْزٍ وَلَحْمٍ فَقَالَ مَا هَذِهِ يَا سَلْمَانُ؟ قُلْتُ صَدَقَةٌ فَلَمْ يَأَكُلْ وَقَالَ لِأَصْحَابِهِ كُلُوا ثُمَّ أَتَيْتُهُ بِجَفْنَةٍ مِنْ خُبْزٍ وَلَحْمٍ فَقَالَ مَا هَذِهِ يَا سَلْمَانُ؟ قُلْتُ هَدِيَّةٌ فَأَكَلَ قَالَ إِنَّا نَأَكُلُ الْهَدِيَّةَ وَلَا نَأَكُلُ الصَّدَقَةَ