According to Galatians 1:18 after Paul became a Christian it was three years before he spent a good amount of time with Peter. Peter was a leader among the disciples. Jesus had talked to Peter and said, ‘Upon this rock I will build my church.’

Galatians 1:

¹¹ Dear brothers and sisters, I want you to understand that the gospel message I preach is not based on mere human reasoning. ¹² I received my message from no human source, and no one taught me. Instead, I received it by direct revelation from Jesus Christ.

¹³ You know what I was like when I followed the Jewish religion—how I violently persecuted God’s church. I did my best to destroy it. ¹⁴ I was far ahead of my fellow Jews in my zeal for the traditions of my ancestors.

¹⁵ But even before I was born, God chose me and called me by his marvelous grace. Then it pleased him¹⁶ to reveal his Son to me so that I would proclaim the Good News about Jesus to the Gentiles.

When this happened, I did not rush out to consult with any human being. ¹⁷ Nor did I go up to Jerusalem to consult with those who were apostles before I was. Instead, I went away into Arabia, and later I returned to the city of Damascus.

¹⁸ Then three years later I went to Jerusalem to get to know Peter, and I stayed with him for fifteen days. ¹⁹ The only other apostle I met at that time was James, the Lord’s brother. ²⁰ I declare before God that what I am writing to you is not a lie.

²¹ After that visit I went north into the provinces of Syria and Cilicia. ²² And still the churches in Christ that are in Judea didn’t know me personally. ²³ All they knew was that people were saying, “The one who used to persecute us is now preaching the very faith he tried to destroy!” ²⁴ And they praised God because of me.