# you will anoint him to be prince

The term prince is used here instead of king. He is the man whom God has chosen to be king of Israel. 

# the land of Benjamin

"the land where people from the tribe of Benjamin live"

# from the hand of the Philistines

"from the control of the Philistines" or "so the Philistines will no longer control them"

# For I have looked on my people with pity

"My people are suffering and I want to help them"