Hebrews 13:8 - Matthew Poole's English Annotations on the Holy Bible

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, Jesus Christ; so that they might be saved by him as their guides were, there being no other way to blessedness, but by Jesus Christ the same, & c., 1 Thessalonians 14:6. Or a reason enforcing what followeth, that since Jesus 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, throughout all times and ages, he never leaves nor forsakes them; so Christ doctrinal, in his faith, law, and rule of conversation, Ephesians 4:20,21. The pure, full, and entire religion of Christ is unchangeable, being simply, indivisibly, and constantly the same throughout all measures of time, Matthew 5:18 2 Corinthians 11:3,4 Ga 1:6,7 Eph 4:4,5 1 Peter 1:23,25.