Acts 26:5

5They have known me for a long time, if they are willing to testify to it, that according to the 26:5 Paul probably is referring to the school of Shammai, which flourished from 30 b.c. to a.d. 20. Gamaliel, Paul’s teacher in the school of Hillel (22:3), discussed and interpreted the teachings of both schools, and often agreed with the teachings of Shammai, so Paul was familiar with Shammai as well as Hillel.strictest sect of our religion, I have lived as a Pharisee.