Sayyidah Umm al-Darda (may Allah be pleased with her) said: Sayyiduna Abu al-Darda (may Allah be pleased with him) said to me: Do not ask anyone for anything. I said: What if I am in need? He said: Then follow the harvesters and look at what falls from them; take it and thresh it, then grind it, then knead it, then eat it, and do not ask anyone for anything.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب اللقطة / 12102
Imam al-Awza'i (may Allah have mercy on him) said: Whatever falls from the hand of the harvester or from the one picking fruit, the owner of the crop has no right over it; it is for passers-by and travellers.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب اللقطة / 12103