John Calvin on Hebrews 2:15

15. And deliver them who, etc. This passage expresses in a striking manner how miserable is the life of those who fear death, as they must feel it to be dreadful, because they look on it apart from Christ; for then nothing but a curse appears in it: for whence is death but from God’s wrath against sin? Hence is that bondage throughout life, even perpetual anxiety, by which unhappy souls are tormented; for through a consciousness of sin the judgment of God is ever presented to the view. From this fear Christ has delivered us, who by undergoing our curse has taken away what is dreadful in death. For though we are not now freed from death, yet in life and in death we have peace and safety, when we have Christ going before us. The same seem to be meant here as before, — “the sons, the children.” Before Christ came, though heirs, yet they were in a state of bondage; so the Apostle represents them in Galatians 4:1-3. See Romans 8:15. — Ed.

But it any one cannot pacify his mind by disregarding death, let him know that he has made as yet but very little proficiency in the faith of Christ; for as extreme fear is owing to ignorance as to the grace of Christ, so it is a certain evidence of unbelief.

Death here does not only mean the separation of the soul from the body, but also the punishment which is inflicted on us by an angry God, so that it includes eternal ruin; for where there is guilt before God, there immediately hell shows itself.

Hebrews Chapter 2:16-18

16. For verily he took not on him the nature of angels; but he took on him the seed of Abraham.

16. Nusquam enim angelos assumit; sed semen Abrahae assumit.

17. Wherefore in all things it behooved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people.

17. Unde fratribus debuit per omnia esse similis, ut misericors esset et fidelis pontifex in iis quae sunt erga Deum, ut peccata expiet populi.

18. For in that he himself hath suffered being tempted, he is able to succor them that are tempted.

18. Ex quo enim ipsi contigit tentari, potest et iis qui tentantur, succurrere.