<p>23:16 <i>But Paul's sister's son heard of their ambush, and he went and entered into the fortress and told Paul</i>- The ambush plan was surely kept as secret as possible. We can therefore assume that this young man was close to the Pharisees, seeing Paul was from a Pharisee family. He would have been involved enough with them to be party to this top secret knowledge, so we can assume he was not a publicly committed Christian. But still he played a part in saving Paul's life. He was presumably known as Paul's relative seeing he was allowed access to Paul. Perhaps this boy like Paul had been sent from Tarsus to be schooled in Pharisaic Judaism in Jerusalem, and due to mixing in those extreme circles he had heard of the plot.</p>