"Jesus started one church that the apostles propagated. What were they teaching? That Jesus came for 144k? That only they had the heavenly hope? That part is a new testament."
Good point. What did Jesus say to them? Well, on the premise of belief in the Bible as the Word of God, inspired by God, we have to accept what the disciples wrote. So with this in mind, the corrections made by Paul to the different churches around and the descriptions throughout the NT, we ARE told what Jesus said to the disciples. Maybe not everything, but what God wanted us to know.
All the rest: "That Jesus came for 144k? That only they had the heavenly hope?.....etc" are completely made up by man.