Surely Allah does not do injustice to the weight of an atom, and if it is a good deed He multiplies it and gives from Himself a great reward.

And We made the people who were deemed weak to mhent the eastern lands and the western ones which We had blessed; and the good word of your Lord was fulfilled in the children of Israel because they bore up (sufferings) patiently; and We utterly destroyed what Firon and his people had wrought and what they built.