Heb 1:8-12, Heb 13:8
In the Old Testament, the psalmist confessed that God is eternal. (Psalms 102:25-27)
Psalms 102:25 Of old hast thou laid the foundation of the earth: and the heavens are the work of thy hands. 26 They shall perish, but thou shalt endure: yea, all of them shall wax old like a garment; as a vesture shalt thou change them, and they shall be changed: 27 But thou art the same, and thy years shall have no end.
The writer of Hebrews confessed that Christ, the Son of God, is eternal. (Heb 1:8-12)
Heb 1:8 But unto the Son he saith, Thy throne, O God, is for ever and ever: a sceptre of righteousness is the sceptre of thy kingdom. 9 Thou hast loved righteousness, and hated iniquity; therefore God, even thy God, hath anointed thee with the oil of gladness above thy fellows. 10 And, Thou, Lord, in the beginning hast laid the foundation of the earth; and the heavens are the works of thine hands: 11 They shall perish; but thou remainest; and they all shall wax old as doth a garment; 12 And as a vesture shalt thou fold them up, and they shall be changed: but thou art the same, and thy years shall not fail.
Christ Jesus is the same forever. (Hebrews 13:8)
Hebrews 13:8 Jesus Christ the same yesterday, and to day, and for ever.