'Strength' in the Bible

so that by two unchangeable things [His promise and His oath] in which it is impossible for God to lie, we who have fled [to Him] for refuge would have strong encouragement and indwelling strength to hold tightly to the hope set before us.

And so [because of the oath’s greater strength and force] Jesus has become the certain guarantee of a better covenant [a more excellent and more advantageous agreement; one that will never be replaced or annulled].

extinguished the power of [raging] fire, escaped the edge of the sword, out of weakness were made strong, became mighty and unbeatable in battle, putting enemy forces to flight.