Berean Standard Bible
1 John 5:10
“Whoever believes in the Son of God has this testimony within him; whoever does not believe God has made Him out to be a liar, because he has not believed in the testimony that God has given about His Son.”

In context
8The Spirit, the water, and the blood—and these three are in agreement.
10Whoever believes in the Son of God has this testimony within him; whoever does not believe God has made Him out to be a liar, because he has not believed in the testimony that God has given about His Son.
11And this is that testimony: God has given us eternal life, and this life is in His Son.
12Whoever has the Son has life; whoever does not have the Son of God does not have life.
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Berean Standard Bible · A modern, readable English translation. Public domain (CC0).