'Light of Israel' in the Bible

But Abishai the son of Zeruiah succored him, and smote the Philistine, and killed him. Then the men of David swore to him, saying, Thou shalt go out no more with us to battle, that thou mayest not extinguish the light of Israel.

And the light of Israel shall be for a fire, and his Holy One for a flame: and it shall burn and devour his thorns and his briers in one day;