John 16:33 (BSB)

I have told you these things so that in Me you may have peace. In the world you will have tribulation. But take courage; I have overcome the world!”

From John 16. Also in the ESV.

Commentary on John 16:33

• John Calvin (Reformed), Calvin's Commentaries on John 16:33: 33. These things I have spoken to you. He again repeats how necessary those consolations are which he had addressed to them; and he proves it by this argument, that numerous distresses and tribulations await them in the world. We ought to attend, first, to this admonition, that all believers ought to be convinced that their life is exposed to many afflictions, that they may be disposed to exercise patience.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on John 16:28-33: Two things Christ here comforts his disciples with: - I. With an assurance that, though he was leaving the world, he was returning to his Father, from whom he came forth Joh 16:28-32, where we have, 1. A plain declaration of Christ's mission from the Father, and his return to him (Joh 16:28): I came forth from the Father, and am come, as you see, into the world.
• Albert Barnes (Presbyterian), Barnes' New Testament Notes on John 16:33: Verse 33. In me. In my presence, and in the aid which I shall render you by the Holy Spirit. In the world. Among the men to whom you are going. You must expect to be persecuted, afflicted, tormented. I have overcome the world. He overcame the prince of this world by his death, .
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on John 16:33: These things I have spoken unto you--not the immediately preceding words, but this whole discourse, of which these were the very last words, and which He thus winds up. that in me ye might have peace--in the sublime sense before explained. (See on Joh 14:27).