Jamieson, Fausset and Brown on Isaiah 65:17

17. As Caleb inherited the same land which his feet trod on (De 1:36; Jos 14:9), so Messiah and His saints shall inherit the renovated earth which once they trod while defiled by the enemy (Is 34:4; 51:16; 66:22; Eze 21:27; Psa 2:8; 37:11; 2Pe 3:13; He 12:26-28 Re 21:1).

not be remembered--See on Is 65:16, note on "troubles"; the words here answer to "the former ... forgotten," &c. The former sorrows of the earth, under the fall, shall be so far from recurring, that their very remembrance shall be obliterated by the many mercies I will bestow on the new earth (Re 21:4-27).