God provides for our greatest need (salvation) through the finished work of Jesus (the Lamb of God) on the cross. The fact that God provides for our greatest need means that He can provide for our every need.
Jehovah-Jireh foresees our needs and can make provision for our needs. But, He must not only foresee the need, He must see our obedience.
When Abraham obeyed God's call, God provided for his need. This is true for us also.