John Gill Commentary Joshua 23:5

"And Jehovah your God, he will thrust them out from before you, and drive them from out of your sight; and ye shall possess their land, as Jehovah your God spake unto you." — Joshua 23:5 (ASV)

And the Lord your God he shall expel them from before you
That is, such of them as yet remained among them:

and drive them from out of your sight ;
the same thing expressed by different words, for the confirmation of it:

and you shall possess their land, as the Lord your God has promised
to you ;
all which is to be understood on condition of their good behaviour towards the Lord, and obedience to his commands; by which tenure they held the possession of the land when put into it, and for their disobedience did not possess the whole.