Where Does Jesus Say "I will save humanity"? I had an old friend ask the following: "Where in the Bible does Jesus say, "I will go save humanity"" (Or something along those lines). I tried to explain God is Jesus, and it was his will. But they were looking for the exact verse. I couldn't think off any the top of my head.

I know it says the Lamb was slain before the foundation of the earth. But that doesn't really say it all. This person is having trouble understanding why Jesus (in particular), would do this for us bad people.
There are indirect passages that state this.

John 3:16-17 ESV For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life. For God did not send his Son into the world to condemn the world, but in order that the world might be saved through him.

John the Baptist had this to say:

John 1:29 ESV The next day he [John the Baptist] saw Jesus coming toward him, and said, “Behold, the Lamb of God, who takes away the sin of the world! ... &quot;

Jesus himself never outright said &quot;I am God. Worship me.&quot; He did this because he wanted his followers to have faith in him. His miracles testified to his Godliness.

John 10:24-25 ESV So the Jews gathered around him and said to him, “How long will you keep us in suspense? If you are the Christ, tell us plainly.” Jesus answered them, “I told you, and you do not believe. The works that I do in my Father's name bear witness about me...
John 14:8-11 ESV Philip said to him, “Lord, show us the Father, and it is enough for us.” Jesus said to him, “Have I been with you so long, and you still do not know me, Philip? Whoever has seen me has seen the Father. How can you say, ‘Show us the Father’? Do you not believe that I am in the Father and the Father is in me? The words that I say to you I do not speak on my own authority, but the Father who dwells in me does his works. Believe me that I am in the Father and the Father is in me, or else believe on account of the works themselves.
John 10:31-33 ESV &quot;I and the Father are one.&quot; The Jews picked up stones again to stone him. Jesus answered them, “I have shown you many good works from the Father; for which of them are you going to stone me?” The Jews answered him, “It is not for a good work that we are going to stone you but for blasphemy, because you, being a man, make yourself God.”

Note the last passage: people say that Jesus is claiming to be God and want to kill him because of it, and Jesus does not correct them.