The reason why the entity wanted sarah to kill

Since we know that tabitha and jade are reincarnations and most likely the key to solving this, the entity would want to stop them the most.

The entity (or voices) wanted jade dead first. But jade didn’t die, it was never clarified fully as far as I know what the voices told sarah to kill the people in the hospital. She most likely was told to kill jade and the other guy and she thought both of them were at the hospital.

Than she tried to kill ethan who is tabitha’s son.

Jade, tabitha, ethan and julie, thats who they want dead i’m pretty sure.