Acts 15:40
And Paul chose Silas, and departed, being recommended by the brethren unto the grace of God.
Cross-reference
Acts 15:32 identifies Silas as a prophet and encourager, explaining why Paul chose him as a companion.
Acts 15:22 shows Silas was chosen as a delegate to Antioch, making him a natural partner for Paul as he now departs.
In Acts 14:26, the same phrase 'commended to the grace of God' is used for Paul and Barnabas, echoing the sending of Paul and Silas.
Acts 16:1-3 continues the narrative: Paul picks up Timothy after setting out with Silas, expanding the missionary team.
Acts 17:4 records believers in Thessalonica — one fruit of Paul and Silas's missionary journey begun here.
In Acts 20:32, Paul commends the Ephesian elders to God and His grace, a similar act of entrusting others to divine care.
In 1 Thess 1:1, Silas (Silvanus) is co-author with Paul — confirming he remained a close companion after being chosen here.