John Gill Commentary Psalms 105:44

"And he gave them the lands of the nations; And they took the labor of the peoples in possession:" — Psalms 105:44 (ASV)

And gave them the lands of the Heathen
The countries of the seven nations that dwelt in Canaan; the Lord did it, who had a right to do it, being the possessor of heaven and earth; and who was provoked unto it by the sins of these Heathens, as well as promised it to his people the Israelites.

And they inherited the labour of the people ;
dwelled in the houses they had built, which they found full of all good things; enjoyed the vineyards and olive trees they had planted, and possessed the wells which they had dug, (Deuteronomy 6:10Deuteronomy 6:11) . In like manner the heavenly Canaan is enjoyed by the saints without any labour of theirs; this inheritance is not of the law, nor of the works of it, it is the gift of God, (Romans 4:14) (6:23) .