Joshua 24:2 - Matthew Poole's English Annotations on the Holy Bible

Unto all the people, i.e. that people which were present, to wit, to the elders, &c., by whom it was to be imparted to all the rest, and to as many of the people as came thither. The flood, or, the river, to wit, Euphrates, as all agree; so called by way of eminency. They served other gods, i.e. both Abraham and Nahor were no less idolaters than the rest of mankind. This is said to prevent their vain boasting in their worthy ancestors, and to assure them that whatsoever good was in or had been done by their progenitors, was wholly born God's free grace, and not for their own merit or righteousness, as the Jews were very apt to conceit.