13:20

during about 450 years: Paul’s discussion of Israelite history begins with a significant event, namely, when God “chose our forefathers.” (Ac 13:17) Paul apparently had in mind the time when Isaac was actually born as the promised offspring. (Ge 17:19; 21:1-3; 22:17, 18) Isaac’s birth definitely settled the question as to whom God would recognize as this offspring, an issue that had been in doubt because of Sarai’s (Sarah’s) barrenness. (Ge 11:30) From this starting point, Paul recounts God’s acts in behalf of His chosen nation down to the time when He gave them judges until Samuel the prophet. The period of “about 450 years,” therefore, apparently spans from Isaac’s birth in 1918 B.C.E. to the year 1467 B.C.E. This period extends 46 years after the start of Israel’s Exodus from Egypt, in 1513 B.C.E. This end point is appropriate because the Israelites spent 40 years wandering in the wilderness and 6 years conquering the land of Canaan.​—Nu 9:1; 13:1, 2, 6; De 2:7; Jos 14:6, 7, 10.