If a morsel of food falls, do not leave it. The Prophet ﷺ said: “When a morsel of any of you falls, let him pick it up, remove any harm from it, and eat it; let him not leave it for Shayṭān… for he does not know in which part of his food the blessing lies.” (Muslim).
العربية: عن جابر رضي الله عنه أنّ النبيّ ﷺ قال: «إذا سقطت لقمة أحدكم فليأخذها فليُمِطْ ما كان بها من أذى وليأكلها، ولا يدعها للشيطان». (مسلم).
Don't discard food that falls — clean it and eat it, honouring the blessing in it.