Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: Sayyiduna Abu al-Qasim (peace and blessings of Allah be upon him) said: "Whenever a servant gives charity from lawful earnings—indeed, Allah Almighty accepts only what is lawful, and only what is lawful ascends towards the sky—then it happens that the Lord takes that charity in His hand, and then He begins to nurture it, just as a person raises and nurtures the offspring of his animal, until that morsel or that date, when they come on the Day of Resurrection, will be like a great mountain."

(Imam Ibn Hibban, may Allah have mercy on him, says:) The statement of the Prophet (peace and blessings of Allah be upon him): "Exactly as if he placed it in the hand of the Most Merciful." This clarifies for you that in these narrations, the words of example are used; it is not intended that the reality of it exists or that its nature is known, because the addressee can only understand these things through the words to which their application is made.