It was narrated from Jabir that the Messenger of Allah ﷺ said: "None of you should wipe his hand until he has licked it, for he does not know where the blessing if in his food.’"
The Prophet Muhammad ﷺ also taught us about gratitude and humility, two important values which are essential for a successful life. By teaching us this hadith, he was reminding us to always show gratitude for what Allah has given us and never forget how blessed we truly are. He was also teaching us humility by reminding us that even small things like licking our fingers can bring great rewards if done with sincerity and faithfulness.