Abu Uthman Nahdi (may Allah have mercy on him) says that once I was present in the service of Hazrat Abu Huraira (may Allah be pleased with him) and I said, "I have heard that you say that for one good deed, a reward of up to one million good deeds can be given?" He replied, "Are you surprised at this? By Allah! I heard the Noble Prophet (peace and blessings be upon him) say that Allah multiplies one good deed until it becomes equal to two million good deeds." Then he recited this verse: "Allah multiplies it and grants a great reward." When Allah has called the reward 'great,' who can know its amount?