John Gill Commentary Joshua 22:18

"that ye must turn away this day from following Jehovah? and it will be, seeing ye rebel to-day against Jehovah, that to-morrow he will be wroth with the whole congregation of Israel." — Joshua 22:18 (ASV)

But that you must turn away this day from following the
Lord ?
&c.] From the worship of the Lord, as the Targum, and so on (Joshua 22:16); not content with the former transgression, but must add this revolt unto it, and at a time which sadly aggravates it:

and it will be, that [seeing] you rebel today against the Lord ;
against the Word of the Lord, as the Targum, and so on (Joshua 22:16);

that tomorrow he will be wroth with the whole congregation of Israel ;
or, in a little time, if a stop is not put to this revolt, the whole body of the people will suffer for it: here they express a concern for the whole nation of Israel, as well as for the glory of God; for sometimes the whole congregation has been charged with the sins of individuals, and punished for it, as a case after mentioned shows; see (Joshua 7:1Joshua 7:5).