If a person professes faith in Messiah (Christ) and yet falls away or makes no progress in holiness, it does not mean that he or she has lost his salvation. It reveals that he or she was never truly born again of water and the Holy Spirit. Many people are just full of emotion and religion, but they are not saved. Many false converts show signs of fruit for a while, but then they fall away because they were never truly born again to begin with. They went out from us because they were never truly of us.
Now it came to pass, when Jesus had finished all these sayings, that He said to His disciples, “You know that after two days is the Passover, and the Son of Man will be delivered up to be crucified.” A lot really happened after Yeshua (Jesus) said this to His disciples. A lot can happen in one Passover week. A lot can happen in 3 days and 3 nights.
I have to warn you especially for some things. Be careful with people who want to explain Bible to you- without being capable of showing their explanations from Bible. Be careful with all explanations that add or take away from Bible. Be prepared examine every teaching or preaching with your Bible- including mine. If you cannot find them in the Bible, then they are not from Yahweh our God.