Jn 15:4-5, Jn 8:56, James 2:21, Heb 11:31, James 2:25
If people say they believe that Jesus is the Christ, but do not act of faith, they do not believe. (James 2:17)
James 2:17 Even so faith, if it hath not works, is dead, being alone.
Christ is our lifeline. Apart from Christ, nothing can be done. (Jn 15:4-5)
Jn 15:4-5 Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me. 5 I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing.
Abraham could offer Isaac to God because he believed that Christ would come as a descendant of Isaac. That is, he believed that God would raise Isaac back to life because of Christ. (James 2:21, Jn 8:56)
James 2:21 Was not Abraham our father justified by works, when he had offered Isaac his son upon the altar?
Jn 8:56 Your father Abraham rejoiced to see my day: and he saw it, and was glad.
Rahab the prostitute also believed that Christ would come to the land of Canaan through rumors and hid the spies. (Heb 11:31, James 2:25)
Heb 11:31 By faith the harlot Rahab perished not with them that believed not, when she had received the spies with peace.
James 2:25 Likewise also was not Rahab the harlot justified by works, when she had received the messengers, and had sent them out another way?