Praise be to Allah,
Mu’tamir narrated to us from Humayd [at-Iaweel] fromAnas ibn Maalik who said,
“The messenger of Allah (peace and blessings be on him) said, ‘If a morsel of food of one of you falls, you should pick it up and remove whatever dirt is on it, and not leave it for Satan.”‘
(Musnad Ah.mad, Vol. 3, p. 100. The isnaad of this hadeeth is Saheeh according to the conditions set by al-Bukhaaree and Muslim.)
Source:
Thulaathiyyaat Musnad Ahmad ibn Hanbal (may Allah have mercy on him)
Reports of Imaam Ahmad that have only three narrators between him and the Prophet, peace, and blessings be upon him.
Shaykh Muhammad ibn Ahmad ibn Saalim as–Saffaareenee al–Hanbalee ~(1114 –1188 AH)