Hebrews 1:3: "He is the radiance of the glory of God and the exact imprint of his nature, and he upholds the universe by the word of his power. After making purification for sins, he sat down at the right hand of the Majesty on high"
Hebrews 4:14: "Since then we have a great high priest who has passed through the heavens, Jesus, the Son of God, let us hold fast our confession."
Hebrews 9:24: "For Christ has entered, not into the holy places made with hands, which are copies of the true things, but into heaven itself, now to appear in the presence of God on our behalf."
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Hebrews 4:14 appears in the first verse, specifically in the first line ("Since our great High Priest, Christ Jesus...") and the last two lines ("Since to heav'n our Lord has passed, / Let us hold our witness fast!"). The second line ("Bears the name above all names") comes from Philippians 2:9-11: "9 Therefore God has highly exalted him and bestowed on him the name that is above every name, 10 so that at the name of Jesus every knee should bow, in heaven and on earth and under the earth, 11 and every tongue confess that Jesus Christ is Lord, to the glory of God the Father."
That Hebrews 4 citation should really extend to verse 16 because the hymn's second verse comes directly from verses 15 and 16: "15 For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin. 16 Let us then with confidence draw near to the throne of grace, that we may receive mercy and find grace to help in time of need." Here's the hymn's second verse for comparison:
That Hebrews 4 citation should really extend to verse 16 because the hymn's second verse comes directly from verses 15 and 16: "15 For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin. 16 Let us then with confidence draw near to the throne of grace, that we may receive mercy and find grace to help in time of need." Here's the hymn's second verse for comparison:
Since we have a priest who suffered,
Knowing weakness, tears, and pain,
Who like us was tried and tempted,
Unlike us, without a stain -
Since He shared our lowly place,
Let us boldly seek His grace.
Hebrews 1:3 appears in the third verse: "Sacrifice and suff'ring over, / Now He sits at God's right hand."
Hebrews 9:24 seems to appear in the last verse. "On our behalf" is rendered as "Mighty advocate and friend" and "Christ has entered... into heaven itself" as "Jesus, high in glory raised."