Hebrews 7:21

(for those Levites who formerly became priests [received their office] without [its being confirmed by the taking of] an oath, but this One [was designated] with an oath through the One who said to Him,

“The Lord has sworn
And will not change His mind or regret it,
‘You (Christ) are a Priest forever’”).

Psalm 110:4

The Lord has sworn [an oath] and will not change His mind:
“You are a priest forever
According to the order of Melchizedek.”

Hebrews 7:17

For it is attested [by God] of Him,

“You (Christ) are a Priest forever
According to the order of Melchizedek.”

1 Samuel 15:29

Also the Splendor and Glory and Eminence of Israel will not lie or change His mind; for He is not a man that He should change His mind.”

Hebrews 6:16-18

Indeed men swear [an oath] by one greater than themselves, and with them [in all disputes] the oath serves as confirmation [of what has been said] and is an end of the dispute.

Treasury of Scripture Knowledge

Summary

Hebrews 7:21

(For those priests were made without an oath; but this with an oath by him that said unto him, The Lord sware and will not repent, Thou art a priest for ever after the order of Melchisedec:)

The lord

Hebrews 7:17

Psalm 110:4

Sware

Hebrews 6:16

General references

Hebrews 7:17

Bible References

The lord

For it is attested [by God] of Him,

“You (Christ) are a Priest forever
According to the order of Melchizedek.”

The Lord has sworn [an oath] and will not change His mind:
“You are a priest forever
According to the order of Melchizedek.”

Sware

Indeed men swear [an oath] by one greater than themselves, and with them [in all disputes] the oath serves as confirmation [of what has been said] and is an end of the dispute.

General references

For it is attested [by God] of Him,

“You (Christ) are a Priest forever
According to the order of Melchizedek.”