Is once saved forever saved?
The bible makes us understand in John 3 v 16, that for God so loved the world that He gave his only begotten son that whosoever believes in him would not persish but have eternal life.

The bible also makes us understand  in John 10 v 28, that Jesus gives us eternal life and we shall never perish and no man can be able to pluck us out of His hands, because the fater that gave us to himm is greater than everyone.