No one who denies the Son has the Father; whoever acknowledges the Son has the Father also. As for you, see that what you have heard from the beginning remains in you. If it does, you also will remain in the Son and in the Father. And this is what he promised us–eternal life. 1 John 2:23-25 NIV
They come as a package deal, the Father, Son, and of course the Holy Spirit. They abide in us. We have been given assurance that through our faith in the Son the promise of eternal life will be given to us.
For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life. For God did not send his Son into the world to condemn the world, but to save the world through him. John 3:16-17 NIV
Very truly I tell you, the one who believes has eternal life. John 6:47 NIV