1)
What is the meaning of "Atah Teda Es Asher Ya'aseh"?
1.
Malbim: You will not need to seek reports. You yourself will know that mighty acts that I will do!
2)
Why did he make David his person guard?
1.
Malbim: He showed David that the reason he wants David near himself is not due to distrust. Just the contrary, it is because he trusts him so much!