1 John 2:25

25AndκαὶthisαὕτηisἐστὶνtheἡpromiseἐπαγγελίαthatἣνHeαὐτὸςpromisedἐπηγγείλατοusἡμῖν,τὴνlifeζωὴντὴνeternalαἰώνιον.

And this is the promise that He promised us: eternal life.