King James Bible
He that despised Moses' law died without mercy under two or three witnesses:

New King James Version
Anyone who has rejected Moses’ law dies without mercy on the testimony of two or three witnesses.

American Standard Version
A man that hath set at nought Moses law dieth without compassion on the word of two or three witnesses:

Berean Study Bible
Anyone who rejected the law of Moses died without mercy on the testimony of two or three witnesses.

Douay-Rheims Bible
A man making void the law of Moses, dieth without any mercy under two or three witnesses:

English Revised Version
A man that hath set at nought Moses' law dieth without compassion on the word of two or three witnesses:

World English Bible
A man who disregards Moses' law dies without compassion on the word of two or three witnesses.

Young's Literal Translation
any one who did set at nought a law of Moses, apart from mercies, by two or three witnesses, doth die,

Hebrews 10:28 Additional Translations ...