§ 02 · King James Bible
1 Samuel 15:11
It repenteth me that I have set up Saul to be king: for he is turned back from following me, and hath not performed my commandments. And it grieved Samuel; and he cried unto the LORD all night.
Simple English
God feels sorry for choosing Saul as king because he stopped listening and disobeyed commands. This made Samuel sad, so he prayed to God all night.
* Work in progress - there may be occasional inaccuracies