Answer
(Fatwa: 865/685=L/1430)
The Hadith mentions:
إن الشيطان يحضر أحدكم عند كل شيء من شأنه حتى يحضره عند طعامه فإذا سقطت من أحدكم اللقمة فليمط ما كان بها من أذى ثم ليأكلها ولا يدعها للشيطان
It means that if morsel falls down, one should eat it after cleaning. Since the Hadith is common without differentiation between the morsel falling down from hand or mouth; therefore in both the cases, it should be eaten after cleaning. It should not be left for the Satan.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband