Acts 9:26
And when Saul was come to Jerusalem, he assayed to join himself to the disciples: but they were all afraid of him, and believed not that he was a disciple.
Cross-references
Acts 9:19 is the immediate predecessor: Paul staying with disciples in Damascus before leaving for Jerusalem.
Acts 22:17 recounts Paul's return to Jerusalem from his perspective, including the temple vision.
In Acts 26:10, Paul recalls imprisoning and killing saints in Jerusalem — this explains the disciples' terror of him.
Acts 26:20 summarizes Paul's preaching in Jerusalem after his conversion, continuing the narrative.
Galatians 1:17-19 presents a different timeline: Paul went to Arabia first, then after three years to Jerusalem.
In Galatians 1:13, Paul describes his violent persecution of the church — this is exactly what the disciples remembered and feared.
In Galatians 1:18, Paul confirms he visited Peter in Jerusalem three years after conversion — this parallels the Acts account of his first visit.
In Galatians 1:23, the churches heard that the former persecutor now preaches — here the Jerusalem disciples are just hearing this, causing initial doubt.