Definition
This idiom illustrates that one's actions will directly influence the treatment or consequences they receive.
He is always willing to help others, a clear case of 'as ye sow, so shall ye reap'.
She was always rude to her colleagues, so it's no wonder she was ostracized. As ye sow, so shall ye reap.
If we study hard now, we will reap the rewards in the future; as ye sow, so shall ye reap.