Hebrews 6:17

So when God wanted to make the unchanging nature of His purpose very clear to the heirs of the promise, He guaranteed it with an oath.
BSB · Berean Standard Bible
Where in God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:
KJV · King James Version
In this way God, being determined to show more abundantly to the heirs of the promise the immutability of his counsel, interposed with an oath,
WEB · World English Bible
Wherein God, being minded to show more abundantly unto the heirs of the promise the immutability of his counsel, interposed with an oath;
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

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Psalm 36:8; Song of Songs 5:1; Isaiah 55:7; John 10:10; 1 Peter 1:3
the heirs
Hebrews 6:12; Hebrews 11:7, 9; Romans 8:17; Galatians 3:29; James 2:5; 1 Peter 3:7
the immutability
Hebrews 6:18; Job 23:13, 14; Psalm 33:11; Proverbs 19:21; Isaiah 14:24, 26, 27; Isaiah 46:10; Isaiah 54:9, 10; Isaiah 55:11; Jeremiah 33:20, 21, 25, 26; Malachi 3:6; Romans 11:29; James 1:17
confirmed it
Gr. interposed himself.
Hebrews 6:16; Genesis 26:28; Exodus 22:11