My name's sake - On my account. Because you are my followers and possess my spirit. See the notes at John 14:13.

Because they know not him that sent me - They will not believe that God has sent me. They do not so understand his character, his justice, or his law, as to see that it was fit that he should send his Son to die. They are so opposed to it, so filled with pride and opposition to a plan of salvation that is so humbling to people, as to be resolved not to believe it, and thus they persecute me, and will also you.

Because they know not him that sent me - This is the foundation of all religious persecution: those who are guilty of it, whether in Church or state, know nothing about God. If God tolerates a worship which professes to have him for its object, and which does not disturb the quiet or peace of society, no man has the smallest right to meddle with it; and he that does fights against God. His letting it pass is at least a tacit command that all should treat it as he has done.

But all these things will they do unto you,.... Christ here signifies, that all the hatred and persecutions raised against his people by the world, would not be on their own account, for any evil actions done by them; they would not suffer as thieves, murderers, and evildoers, but as Christians; or as he says,

for my name's sake: because they were called by his name, and called upon his name; because they professed his name, and confessed him to be the Messiah and Redeemer; because they loved his name Jesus, a Saviour, believed in his name, and hoped in him for eternal life; and also preached him, and in his name salvation, and encouraged others to believe in him; and therefore they had no reason to be ashamed, but rather to rejoice; as they afterwards did, that they were counted worthy to suffer shame for his name: besides, this malice and hatred of theirs arose from ignorance of the Father of Christ:

because they know not him that sent me; they did not know that Jesus was the Christ, and sent of God; they did not acknowledge him to be so, or the Father to be the sender of him; and because Christ and his disciples asserted this, therefore they were the objects of their hatred.

For my name's sake (διὰ τὸ ὄνομά μου)

Literally, on account of my name. The name of Christ represented the faith, the attitude, the claims, and the aim of the disciples. His name was their confession. Luther says: "The name of Christ from your mouth will be to them nothing but poison and death."

{7} But all these things will they do unto you for my name's sake, because they know not him that sent me.

(7) The hatred that the world bears against Christ proceeds from the stupidity of the mind, which nonetheless is voluntarily blind, so that those of the world cannot give any excuse to explain away their fault.

15:21 For my name's sake. That name, so sweet to the saved, is a hateful thing to his enemies. Jewish persecutors bade Christians to teach no more in the name (Ac 4:18 5:40); Gentile rulers bade them blaspheme the name or die.

15:21 All these things will they do to you, because they know not him that sent me - And in all ages and nations they who know not God will, for this cause, hate and persecute those that do.

15:18-25 How little do many persons think, that in opposing the doctrine of Christ as our Prophet, Priest, and King, they prove themselves ignorant of the one living and true God, whom they profess to worship! The name into which Christ's disciples were baptized, is that which they will live and die by. It is a comfort to the greatest sufferers, if they suffer for Christ's name's sake. The world's ignorance is the true cause of its hatred to the disciples of Jesus. The clearer and fuller the discoveries of the grace and truth of Christ, the greater is our sin if we do not love him and believe in him.