24 Truly, truly, I say to you, He who hears my word, and believes in him who sent me, has everlasting life, and does not come into judgment ; but has passed out of death into life.
John 5:24 This is a very strong passage on the subject of receiving eternal life. The condition is that one hears the word. The word "word¨ is singular and this refers to Christ's declaration about His person [His deity and Saviorhood]. Then he should believe in God the Father who sent him. This means believing the testimony of the Father concerning the person of the Son [His deity and Saviorhood]. Thus the condition of receiving eternal life is believing or trusting in the person of Jesus Christ and His work on the cross, Him being God and Savior. The One whom God sent to die for our sins and rose again.
Eternal life is a present possession of every genuine believer. He is no longer under judgment. Then he has passed from spiritual death unto life. And he stays on the side of life permanently because the verb "passed" metabebeken is in the perfect tense. Once a person receives eternal life he never reverts to spiritual death. He has eternal life forever.