Once saved, always saved (OSAS)?

(Exodus 32:33) And the Lord said to Moses, “Whoever has sinned against Me, I will blot him out of My book."

• If OSAS were true, how can a name be blotted out?

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(Revelation 3:5) He who overcomes shall be clothed in white garments, and I will not blot out his name from the Book of Life; but I will confess his name before My Father and before His angels.

• If OSAS were true, what happens to those who do not overcome?

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(Revelation 22:18-19) For I testify to everyone who hears the words of the prophecy of this book: If anyone adds to these things, God will add to him the plagues that are written in this book; and if anyone takes away from the words of the book of this prophecy, God shall take away his part from the Book of Life, from the holy city, and from the things which are written in this book. 

• If OSAS were true, how can a person be taken away from the Book of Life?

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(Romans 11:21-22) For if God did not spare the natural branches, He may not spare you either. Therefore consider the goodness and severity of God: on those who fell, severity; but toward you, goodness, if you continue in His goodness. Otherwise you also will be cut off.

• If OSAS were true, how can a believer be cut off?

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(Luke 8:13) But the ones on the rock are those who, when they hear, receive the word with joy; and these have no root, who believe for a while and in time oftemptation fall away.

• If OSAS we true, how can a believer fall away?

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(2 Thessalonians 2:1-3) Now, brethren, concerning the coming of our Lord Jesus Christ and our gathering together to Him, we ask you, not to be soon shaken in mind or troubled, either by spirit or by word or by letter, as if from us, as though the day of Christ had come. Let no one deceive you by any means; for that Day will not come unless the falling away comes first, and the man of sin is revealed, the son of perdition

• If OSAS were true, how is the prophesy of believers falling away possible?

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(Acts 20:28-31) Therefore take heed to yourselves and to all the flock, among which the Holy Spirit has made you overseers, to shepherd the church of God which He purchased with His own blood. For I know this, that after my departure savage wolves will come in among you, not sparing the flock. Also from among yourselves men will rise up, speaking perverse things, to draw away the disciples after themselves. Therefore watch, and remember that for three years I did not cease to warn everyone night and day with tears.

• If OSAS were true, how can overseers and shepherds (with the Holy Spirit) later become wolves?

• If OSAS were true, why does Paul shed tears and warn? 

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(Revelation 3:16) So then, because you are lukewarm, and neithercold nor hot, I will vomit you out of My mouth.

• If OSAS were true, how can a person be inside the body of Christ, and then vomited out?

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(2 Peter 3:9) The Lord is not slack concerning His promise, as some count slackness, but is longsuffering toward us, not willing that any should perish but that all should come to repentance.

• If OSAS were true, how does Peter write of God's longsuffering toward believers who may perish? 

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(1 Peter 4:17) For the time has come for judgment to begin at the house of God; and if it begins with us first, what will be the end of those who do not obey the gospel of God?

• If OSAS were true, how could God's judgement come to those who are always saved?