Remember the word which Moses the servant of the LORD commanded you, saying, The LORD your God hath given you rest, and hath given you this land. Remember the word - He puts the Reubenites, etc., in remembrance of the engagements they had made with Moses (See Numbers 32:20) when he granted them their portion on the east side of Jordan.
Related Commentaries of Joshua 1:13
Joshua 1:13
13 Remember the word which Moses the servant of the LORD commanded you, saying, The LORD your God hath given you rest, and hath given you this land.