From Paul Perspective
Romans: 10 9-10
9 If you declare with your mouth, “Jesus is Lord” and believe in your heart that God raised him from the dead, you will be saved.
10 For it is with your heart that you believe and are justified, and it is with your mouth that you profess your faith and are saved.
Act: 16: 31
They replied, “Believe in the Lord Jesus, and you will be saved-you and your household.
John: 6: 28-29
27 Do not work for food that spoils, but for food that endures to eternal life, which the Son of Man will give you. For on him God the Father has placed his seal of approval.”
28 Then they asked him, “What must we do to do the works God requires?”
29 Jesus answered, “The work of God is this: to believe in the one he has sent.”
John: 11: 25
25 Jesus said to her, “I am the resurrection and the life. The one who believes in me will live, even though they die;
John: 12: 44-50
44 Then Jesus cried out, “Whoever believes in me does not believe in me only, but in the one who sent me. 45 The one who looks at me is seeing the one who sent me. 46 I have come into the world as a light,so that no one who believes in me should stay in darkness.
47 “If anyone hears my words but does not keep them, I do not judge that person. For I did not come to judge the world, but to save the world. 48 There is a judge for the one who rejects me and does not accept my words; the very words I have spoken will condemn them at the last day. 49 For I did not speak on my own, but the Father who sent me commanded me to say all that I have spoken. 50 I know that his command leads to eternal life. So whatever I say is just what the Father has told me to say.”
John: 14: 6
6 Jesus answered, “I am the way and the truth and the life. No one comes to the Father except through me.
John: 17: 3
3 Now this is eternal life: that they know you, the only true God, and Jesus Christ, whom you have sent.
John: 17: 20-26
20 “My prayer is not for them alone. I pray also for those who will believe in me through their message, 21 that all of them may be one,Father, just as you are in me and I am in you. May they also be in us so that the world may believe that you have sent me. 22 I have given them the glory that you gave me, that they may be one as we are one— 23 I in them and you in me—so that they may be brought to complete unity. Then the world will know that you sent me and have loved them even as you have loved me.
24 “Father, I want those you have given me to be with me where I am, and to see my glory, the glory you have given me because you loved me before the creation of the world.
25 “Righteous Father, though the world does not know you, I know you, and they know that you have sent me. 26 I have made you known to them, and will continue to make you known in order that the love you have for me may be in them and that I myself may be in them.”