The Bible does not say that Jesus saved any thieves from being crucified. The Bible says that two criminals were crucified alongside Jesus. One of the criminals mocked Jesus, while the other asked Jesus to remember him when he came into his kingdom. Jesus then told the man, "Truly I tell you, today you will be with me in paradise." (Luke 23:39-43)
There is no mention of a third thief or of any thief being saved from crucifixion.