New Living Translation
This new system was established with a solemn oath. Aaron’s descendants became priests without such an oath,

American Standard Version
And inasmuch as it is not without the taking of an oath

Berean Study Bible
And none of this happened without an oath. For others became priests without an oath,

Douay-Rheims Bible
And inasmuch as it is not without an oath, (for the others indeed were made priests without an oath;

English Revised Version
And inasmuch as it is not without the taking of an oath

King James Bible
And inasmuch as not without an oath he was made priest:

World English Bible
Inasmuch as he was not made priest without the taking of an oath

Young's Literal Translation
And inasmuch as it is not apart from oath, (for those indeed apart from oath are become priests,

Hebrews 7:20 Additional Translations ...