Joshua 3:4; Joshua 22:19

4 "However, there shall be between you and it a distance of about 2,000 cubits by measure. Do not come near it, that you may know the way by which you shall go, for you have not passed this way before ."
19 'If, however, the land of your possession is unclean, then cross into the land of the possession of the LORD , where the LORD'S tabernacle stands, and take possession among us. Only do not rebel against the LORD , or rebel against us by building an altar for yourselves, besides the altar of the LORD our God.