مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنْ مُعَمَّرِ بْنِ خَلَّادٍ قَالَ سَمِعْتُ الرِّضَا ( عليه السلام ) يَقُولُ مَنْ أَكَلَ فِي مَنْزِلِهِ طَعَاماً فَسَقَطَ مِنْهُ شَيْ‏ءٌ فَلْيَتَنَاوَلْهُ وَ مَنْ أَكَلَ فِي الصَّحْرَاءِ أَوْ خَارِجاً فَلْيَتْرُكْهُ لِطَائِرٍ أَوْ سَبُعٍ .
15. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa from Mu’ammar ibn Khallad who has said the following: “I once heard al-Rida’ , saying, ‘If one eats food in his house and pieces fall, he must pick them up; but if one eats in wilderness or out of the house he can leave such pieces for the birds and beasts.’” 