Matthew Poole and continuators on Hebrews 13:8

8 Jesus Christ the same yesterday, and to day, and for ever.

Though this hath no term of connection; yet it may be referred either to what precedeth or followeth it; for the Apostle is not here dropping Aphorisms, but pressing on the Subjects of Christ's Kingdom known Duties. It is here interposed as a weighty Reason of the Duty foregoing, to remember their Guides, imitate their Faith, and consider the end of their Conversation, for they taught, believed in, conversed with, and at last were perfected by Iesus Christ; so that they might be saved by him as their Guides were, there being no other way to Blessedness, but by Iesus Christ the same, &c. John 14.6. Or a Reason inforcing what followeth, That since Iesus Christ is the same, as in his Person so in his Doctrine, Faith and Conversation which he enjoineth on his Subjects, they should not be carried about with divers and strange Doctrines. Jesus Christ personal is immutable in his care and love to his mystical Body, and all the Members of it, through out all Times and Ages; he never leaves nor forsakes them; so Christ Doctrinal in his Faith, Law, and Rule of Conversation, Ephes. 4.20, 21. The pure, full, and intire Religion of Christ is unchangeable, being simply, indivisibly and constantly the same throughout all measures of time, Matth. 5.18. 2 Cor. 11.3, 4. Gal. 1.6, 7. Ephes. 4.4, 5. 1 Pet. 1.23, 25.

Marginal references: Rev. 1.4.