Hebrews 1:12

shalt thou fold them up Lit., "Thou shalt roll them up." This reading (ἑλίξελς) is found in most MSS. and is perhaps an unconscious reminiscence of Isaiah 34:4 (comp. Revelation 6:14); but א, D read "thou shalt changethem" (ἀλλάξεις), as in the original, and in the LXX. (Cod. Alex.). On this final consummation, and the destruction of the material universe, see Matthew 24:35; 2 Peter 3:7; Revelation 21:1.

thou art the same In the Hebrew (literally) "Thou art He."

thy years shall not fail i.e. they shall never come to an end (Hebrews 13:8; Revelation 1:8).