I’ve heard people say that the God of the Old Testament isn’t the same as the God of the New Testament.

Is there a difference? And what is it?

I think the difference is this: In the Old Testament God told us what to do. In the New Testament he asks us to follow his will and he even provided us with an example to show us the way.

Hebrews 4:14-16 KJV
Seeing then that we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast our profession. [15] For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin. [16] Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.