John 5:24 Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life.
John 5:24 "Most assuredly I tell you, he who hears my word, and believes him who sent me, has eternal life, and doesn't come into judgment, but has passed out of death into life. (WEB)
Note: The person who believed:
1. presently has eternal life.
2. will not come into condemnation in the future.
3. has already passed from spiritual death into spiritual life.
One cannot go backwards. One cannot go from life back to death.
One cannot come back into condemnation once that promise has already been made by the Lord Jesus Christ.
If one presently has eternal life, and eternal life should end at any point, then that "eternal" would become "temporary" and Jesus Christ would be found to be a liar.