In Matthew chapter 25 Jesus tells the story of a master that gave talents to three of his servants. Two of the servants doubled the talents they were given but one servant was afraid and hid his talent. When the master returned, the two productive servants were reward for their stewardship but the servant that wasted his talent was punished.
The master said:
You wicked and slothful servant! You knew that I reap where I have not sowed, and gather where I have not winnowed? Then you ought to have invested my money with the bankers, and at my coming I should have received what was my own with interest. So take the talent from him, and give it to him who has the ten talents. For to every one who has will more be given, and he will have abundance; but from him who has not, even what he has will be taken away. And cast the worthless servant into the outer darkness; there men will weep and gnash their teeth. - Matthew 25:25-29
Even in Bible times people invested with bankers. This infographic by Kiboo.com explains how interest rates can increase a person's savings.