Like in Acts 21:22 and Acts 26:16-18 where Jesus told Paul that He was sending him to preach the gospel to the Gentiles?
No, it’s a common saying like “An apple a day keeps the doctor away” for example. We all quote this one line that Paul says Jesus said — but that the actual words of Jesus saying it aren’t in the Bible. Thus, proving that information got handed down person to person, in this case, by Paul.
I’ll find out what it is today and write it down, then post it later tonight.