fourteen.

Galatians 1:18
Only after three years did I go up to Jerusalem to confer with Cephas, and I stayed with him fifteen days.

I went.

Acts 15:2-4
So Paul and Barnabas engaged these men in sharp debate. The two of them were appointed, along with some other believers, to go up to Jerusalem to see the apostles and elders about this question. . . .

Barnabas.

Galatians 2:13
The other Jews joined in his hypocrisy, so that by their hypocrisy even Barnabas was led astray.

Acts 4:36, 37
Joseph, a Levite from Cyprus, whom the apostles called Barnabas (meaning Son of Encouragement), . . .

Acts 11:25, 30
Then Barnabas went to Tarsus to look for Saul, . . .

Acts 12:25
When Barnabas and Saul had fulfilled their mission to Jerusalem, they returned, bringing with them John, also called Mark.

Acts 13:2, 50
While they were worshiping the Lord and fasting, the Holy Spirit said, "Set apart for Me Barnabas and Saul for the work to which I have called them." . . .

Acts 14:12
Barnabas they called Zeus, and Paul they called Hermes, because he was the chief speaker.

Acts 15:25, 36-39
So we all agreed to choose men to send you along with our beloved Barnabas and Paul, . . .

1 Corinthians 9:6
Or are Barnabas and I the only apostles who must work for a living?

Colossians 4:10
My fellow prisoner Aristarchus sends you greetings, as does Mark the cousin of Barnabas. You have already received instructions about him: If he comes to you, welcome him.

Titus.

Galatians 2:3
Yet not even Titus, who was with me, was compelled to be circumcised, even though he was a Greek.

2 Corinthians 8:16, 23
But thanks be to God, who put into the heart of Titus the same devotion I have for you. . . .

Titus 1:4
To Titus, my true child in our common faith: Grace and peace from God the Father and Christ Jesus our Savior.