Where in the Bible does Jesus claim He is God? One example is in John 10, where he refers to His sheep:
I give them eternal life, and they will never perish, and no one will snatch them out of my hand. My Father, who has given them to me, is greater than all, and no one is able to snatch them out of the Father’s hand. I and the Father are one.
Jesus says His sheep cannot snatched out of His hand, nor His Father’s hand. Jesus is saying His hand and the Father’s hand are the same! Because the Father and I are one.
You may have heard that John 10:30 cannot be used to prove Jesus’ divinity because Jesus also prays that the 12 disciples would also be one with the Father. Is that true?
I do not ask for these only, but also for those who will believe in me through their word, that they may all be one, just as you, Father, are in me, and I in you, that they also may be in us, so that the world may believe that you have sent me.
The trick here is that “one” in John 10 does not mean the same thing in John 17. The same word can have different meanings when wrapped within different contexts. It’s important to remember that the Bible is read as stories which each have their own context, and that verses cannot be cherry picked and forced into a particular meaning because they use the same word.
What does “one” John 17:20-21 refer to? The prior verse gives context as Jesus starts to establish relationships:
As you sent me into the world, so I have sent them into the world. And for their sake I consecrate myself, that they also may be sanctified in truth.
Jesus continues to develop relationships around one-ness, or unity:
The glory that you have given me I have given to them, that they may be one even as we are one, I in them and you in me, that they may become perfectly one, so that the world may know that you sent me and loved them even as you loved me.
The key here is the phrase that they may be one even as we are one. Jesus is asking for unity among the apostles, just as their is unity among Himself and the Father. The one-ness of Jesus and the Father is symbolic of the unity and one-ness of the apostles, that they may become perfectly one.
Jesus and the Father are united in purpose, as Jesus was sent by the Father. So too is Jesus sending the apostles, as you sent me into the world, so I have sent them into the world.
The unity is derived from the love between Jesus and the Father, and the apostles are to be united so that the world may know that you sent me and loved them even as you loved me.