Jabir (May Allah be pleased with him) reported: The Messenger of Allah ﷺ commanded the licking of fingers and the gleaning of the dish, saying, "You do not know in which portion the blessing lies". Muslim.
The Prophet Muhammad (peace be upon him) also taught us about gratitude and thankfulness towards Allah for His many blessings in life. We should never forget how much He has given us, even if it is something small like a meal or a snack. By cleaning up after ourselves and making sure no blessing is left behind, we can show our appreciation for what He has provided for us in this world. This hadith reminds us of how important it is to take care of ourselves by practicing good hygiene when handling food items as well as showing gratitude towards Allah by making sure no blessing goes unnoticed or unappreciated!