They did not destroy the nations of which the Lord spoke unto them.

did not

Joshua 15:63 But the children of Juda could not destroy the Jebusite that dwelt in Jerusalem: and the Jebusite dwelt with the children of Juda in Jerusalem until this present day.

Joshua 16:10 And the children of Ephraim slew not the Chanaanite, who dwelt in Gazer: and the Chanaanite dwelt in the midst of Ephraim until this day, paying tribute.

Joshua 17:12-16 Neither could the children of Manasses overthrow these cities, but the Chanaanite began to dwell in his land. . . .

Joshua 23:12,13 But if you will embrace the errors of these nations that dwell among you, and make marriages with them, and join friendships: . . .

Judges 1:19,21,27-35 And the Lord was with Juda, and he possessed the hill country: but was not able to destroy the inhabitants of the valley, because they had many chariots armed with scythes. . . .

Matthew 17:19-21 Jesus said to them: Because of your unbelief. For, amen I say to you, if you have faith as a grain of mustard seed, you shall say to this mountain: Remove from hence hither, and it shall remove: and nothing shall be impossible to you. . . .

concerning

Numbers 33:52,55,56 Destroy all the inhabitants of that land: Beat down their pillars, and break in pieces their statues, and waste all their high places, . . .

Deuteronomy 7:2,16,23,24 And the Lord thy God shall have delivered them to thee, thou shalt utterly destroy them. Thou shalt make no league with them, nor shew mercy to them: . . .

Deuteronomy 20:16,17 But of those cities that shall be given thee, thou shalt suffer none at all to live: . . .

1 Samuel 16:3,22,23 And thou shalt call Isai to the sacrifice, and I will shew thee what thou art to do, and thou shalt anoint him whom I shall shew to thee. . . .