'Assure' in the Bible

And then when he hears the words of this oath, then {he will assure himself} in his heart, {saying}, '{Safety shall be mine even though I go in the stubbornness of my heart},' thereby destroying the well-watered [land] [along] with the parched.

Draw the spear and javelin against my pursuers,and assure me: “I am your deliverance.”

For the seller shall not return to that which is sold, even though he were yet alive amongst the living: for the vision is touching the whole multitude thereof; it shall not be revoked; and none shall through his iniquity assure his life.