Since the fall in the Garden of Eden, all of us have been born with a sinful nature that acts as a poison within us. Our loving Lord Jesus has provided a remedy. It is his very own sin-cleansing blood. All we need do is confess our need for it and accept it. The following is a picture of Salvation from the Old Testament:
Numbers
21:5 And the people spake against God, and against Moses, Wherefore have ye brought us up out of Egypt to die in the wilderness? for [there is] no bread, neither [is there any] water; and our soul loatheth this light bread.
21:6 And the LORD sent fiery serpents among the people, and they bit the people; and much people of Israel died.
21:7 Therefore the people came to Moses, and said, We have sinned, for we have spoken against the LORD, and against thee; pray unto the LORD, that he take away the serpents from us. And Moses prayed for the people.
21:8 And the LORD said unto Moses, Make thee a fiery serpent, and set it upon a pole: and it shall come to pass, that every one that is bitten, when he looketh upon it, shall live.
21:9 And Moses made a serpent of brass, and put it upon a pole, and it came to pass, that if a serpent had bitten any man, when he beheld the serpent of brass, he lived.
Those poisonous snakes represent sin in our lives. They came when Adam disobeyed and the curse fell upon all men.
That brass serpent that God commanded to be made represented His very own Son, Jesus. He was nailed to a wooden pole and his blood was spilled as an antidote for our sins. What must we do to be cured from that deadly poison of sin within? Just Behold Him, believe and receive Him now. There is nothing that we can add to what He has already done. Just believe Him and receive Him today. Just look up and behold.
That is how one begins a new life in Christ. That is how to be born again.