“The state of death in which Christ entered when He died was as essentially a part of His humiliation as His spiritual suffering on the cross. In both together He completed His perfect obedience.
He drank the cup of suffering to the last drop and tasted death in all its bitterness in order to completely deliver us from the fear of death and death itself.
Thus He destroyed him who had the power of death and by a single offering perfected for all time those who are sanctified (Hebrews 10:14).”
–Herman Bavinck, Reformed Dogmatics: Sin and Salvation in Christ, Volume 3, Ed. John Bolt and trans. John Vriend (Grand Rapids, MI: Baker Academic, 2006), 3: 417.