SEV Biblia, Chapter 3:1
¶ Estos, pues, son los gentiles que dejó el SEÑOR para probar con ellos a Israel, a todos aquellos que no habían conocido todas las guerras de Canaán;
Clarke's Bible Commentary - Judges 3:1
Verse 1. Now these are the nations] The nations left to prove the Israelites were the five lordships or satrapies of the Philistines, viz., Gath, Askelon, Ashdod, Ekron, and Gaza; the Sidonians, the Hivites of Lebanon, Baal-hermon, &c.; with the remains of the Canaanites, viz., the Hittites, Amorites, Perizzites, and Jebusites. Those who were left to be proved were those Israelites that had not seen all the wars of Canaan.
John Gill's Bible Commentary
Ver. 1. Now these [are] the nations which the Lord left to prove Israel by them , etc.] Which are later mentioned, ( Judges 3:3,5); [even] as many [of Israel] as had not known all the wars of Canaan ; those that Joshua, and the people of Israel under him, had with the Canaanites, when they first entered the land and subdued it; being then not born, or so young as not to have knowledge of them, at least not able to bear arms at that time.
Matthew Henry Commentary
Verses 1-7 - As the Israelites were a type of the church on earth, they were not to be idle and slothful. The Lord was pleased to try them by the remain of the devoted nations they spared. Temptations and trials detect the wickedness of the hearts of sinners; and strengthen he graces of believers in their daily conflict with Satan, sin, and this evil world They must live in this world, but they are not of it, and are forbidde to conform to it. This marks the difference between the followers of Christ and mere professors. The friendship of the world is more fata than its enmity; the latter can only kill the body, but the forme murders many precious souls.
Original Hebrew
ואלה 428 הגוים 1471 אשׁר 834 הניח 3240 יהוה 3068 לנסות 5254 בם את 853 ישׂראל 3478 את 853 כל 3605 אשׁר 834 לא 3808 ידעו 3045 את 853 כל 3605 מלחמות 4421 כנען׃ 3667