1 Corinthians 16:10

Now Paul also arrived at Derbe and at Lystra. And behold, a disciple was there, named Timothy, the son of a Jewish woman who was a believer, but his father was a Greek,

For this reason I have sent to you Timothy, who is my beloved and faithful child in the Lord, and who will remind you of my ways which are in Christ, just as I teach everywhere in every church.

Therefore, my beloved brothers, be steadfast, immovable, always abounding in the work of the Lord, knowing that your labor is not in vain in the Lord.

Paul, an apostle of Christ Jesus by the will of God, and Timothy our brother, To the church of God which is at Corinth with all the saints who are throughout Achaia:

For I have no one else of kindred spirit who will genuinely be concerned about your circumstances.

But you know of his proven worth, that he served with me in the furtherance of the gospel like a child serving his father.