What does Acts 13:19 mean?
The first part of Paul's message to the Jews in Pisidian Antioch focuses on how God has saved the Israelites throughout their history (Acts 13:16–25). He saved them from slavery in Egypt and from judgment when they grumbled and rebelled against Him. When they reached the Promised Land, He saved them from the armies of seven inhabiting nations: the Hittites, the Girgashites, the Amorites, the Canaanites, the Perizzites, the Hivites, and the Jebusites (Deuteronomy 7:1).Something Paul doesn't mention, but which the Jews in his audience know, is that God only saved the Israelites when they trusted Him. When the Israelites had faith in and obeyed God, their armies won (Joshua 6). When they disobeyed God and lost faith in Him, their enemies won (Joshua 7). The list of land and people unconquered by the Israelites includes the Jebusites (Joshua 15:63), who remained in Jerusalem until David's time (2 Samuel 5:6–7), and several tribes of the Canaanites (Joshua 16:10; 17:12–13). In addition, the Gibeonites tricked the Israelites into letting them stay (Joshua 9).
Overall, the Israelites did receive their inheritance—just not all of it (see Genesis 15:18–21). Presumably, the Jews will inhabit the borders God promised during the millennial kingdom. At that time, God will soften the hearts of His people, and they will gladly accept His rule and His blessings. In the present, Paul calls the people to trust in God's Savior for the forgiveness of their sins (Acts 13:23–25, 38–41).