The Greek of John 3:16 is not a single word corresponding to “whosoever.” It is πᾶς ὁ πιστεύων—“everyone who is believing.” The restriction is unchanged: only those who believe have eternal life in Him.

The present participle therefore points to ongoing belief as what results in eternal life. That is still not works. Faith does not become labor merely because it lasts.

Eternal life is given and kept by Jesus Himself. No one can snatch His true sheep from His hand. Real faith endures to the end; final rejection of Christ reveals a heart that never truly belonged to Him. Trust Him, remain in Him, and rest in His keeping power.