Joshua 4:21 YLT

¹⁹  And the people have come up out of the Jordan on the tenth of the first month, and encamp in Gilgal, in the extremity east of Jericho;

²⁰  and these twelve stones, which they have taken out of the Jordan, hath Joshua raised up in Gilgal.

²¹  And he speaketh unto the sons of Israel, saying, 'When your sons ask their fathers hereafter, saying, What 'are' these stones?

²²  then ye have caused your sons to know, saying, On dry land Israel passed over this Jordan;

²³  because Jehovah your God dried up the waters of the Jordan at your presence, till your passing over, as Jehovah your God did to the Red Sea which He dried up at our presence till our passing over;