Christians are to restore the fallen:
Your name can be blotted out of the book of life:
After God forgives your sin, you can lose your salvation by not forgiving others:
Galatians 6:1, "Brethren, if a man be overtaken in a fault, ye which are spiritual, restoresuch an one in the spirit of meekness; considering thyself, lest thou also be tempted."
James 5:19-20, "Brethren, if any of you do err from the truth, and one convert him; Let him know, that he which converteth the sinner from the error of his way shall save a soul from death, and shall hide a multitude of sins."
Your name can be blotted out of the book of life:
Exodus 32:32-33, "Yet now, if thou wilt forgive their sin--; and if not, blot me, I pray thee, out of thy book which thou hast written. And the LORD said unto Moses, Whosoever hath sinned against me, him will I blot out of my book."
Deuteronomy 9:14, "Let me alone, that I may destroy them, and blot out their name from under heaven: and I will make of thee a nation mightier and greater than they."
Deuteronomy 29:20, "The LORD will not spare him, but then the anger of the LORD and his jealousy shall smoke against that man, and all the curses that are written in this book shall lie upon him, and the LORD shall blot out his name from under heaven."
Psalms 69:28, "Let them be blotted out of the book of the living, and not be written with the righteous."
Revelation 3:5, "He that overcometh, the same shall be clothed in white raiment; and I will not blot out his name out of the book of life, but I will confess his name before my Father, and before his angels."
After God forgives your sin, you can lose your salvation by not forgiving others:
Matthew 18:23-35, "Therefore is the kingdom of heaven likened unto a certain king, which would take account of his servants. And when he had begun to reckon, one was brought unto him, which owed him ten thousand talents. But forasmuch as he had not to pay, his lord commanded him to be sold, and his wife, and children, and all that he had, and payment to be made. The servant therefore fell down, and worshipped him, saying, Lord, have patience with me, and I will pay thee all. Then the lord of that servant was moved with compassion, and loosed him, and forgave him the debt. But the same servant went out, and found one of his fellowservants, which owed him an hundred pence: and he laid hands on him, and took him by the throat, saying, Pay me that thou owest. And his fellowservant fell down at his feet, and besought him, saying, Have patience with me, and I will pay thee all. And he would not: but went and cast him into prison, till he should pay the debt. So when his fellowservants saw what was done, they were very sorry, and came and told unto their lord all that was done. Then his lord, after that he had called him, said unto him, O thou wicked servant, I forgave thee all that debt, because thou desiredst me: Shouldest not thou also have had compassion on thy fellowservant, even as I had pity on thee? And his lord was wroth, and delivered him to the tormentors, till he should pay all that was due unto him. So likewise shall my heavenly Father do also unto you, if ye from your hearts forgive not every one his brother their trespasses."