The faith of Abram.
God gave Abram good news. He believed the good news and obeyed. It started this way, “The Lord said to Abram, ‘ Go….'” (Genesis 12:1) Scripture doesn’t say how this happened, like it does with Moses and the burning bush. “The Lord said” doesn’t give us much to go on. Was it an audible voice? Was the Father’s voice audible when He lead you to Jesus? It doesn’t matter how God made His will known, Abram heard, believed and “went, as the Lord had told him;” (Genesis 12:4)
Abram believed the good news. If he had not believed God, he would not have received the promises. “Therefore, the promise comes by faith, so that it may be by grace and may be guaranteed to all Abraham’s offspring—not only to those who are of the law but also to those who have the faith of Abraham. He is the father of us all.” (Romans 4:16)
The gospel of our Lord is better news than the good news Abram received. He was promised land, we have been promised eternity. Jesus’ death was followed by His resurrection, that is our promised hope. Resurrection. “For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God— not by works, so that no one can boast.” (Ephesians 2:8-9) Salvation is the gift of God to those who believe. And as God told Abram, so does Jesus tell His disciples, “Go!”
He said to them, “Go into all the world and preach the gospel to all creation.” (Mark 16:15) There are lots of ways this can be done when hearing and having the faith of Abram.