King James Bible
Also the sons of the stranger, that join themselves to the LORD, to serve him, and to love the name of the LORD, to be his servants, every one that keepeth the sabbath from polluting it, and taketh hold of my covenant;

New King James Version
“Also the sons of the foreigner Who join themselves to the LORD, to serve Him, And to love the name of the LORD, to be His servants— Everyone who keeps from defiling the Sabbath, And holds fast My covenant—

American Standard Version
Also the foreigners that join themselves to Jehovah, to minister unto him, and to love the name of Jehovah, to be his servants, every one that keepeth the sabbath from profaning it, and holdeth fast my covenant;

Berean Study Bible
And the foreigners who join themselves to the LORD to minister to Him, to love the name of the LORD, and to be His servants—all who keep the Sabbath without profaning it and who hold fast to My covenant—

Douay-Rheims Bible
And the children of the stranger that adhere to the Lord, to worship him, and to love his name, to be his servants: every one that keepeth the sabbath from profaning it, and that holdeth fast my covenant:

English Revised Version
Also the strangers, that join themselves to the LORD, to minister unto him, and to love the name of the LORD, to be his servants, every one that keepeth the sabbath from profaning it, and holdeth fast by my covenant;

World English Bible
Also the foreigners who join themselves to Yahweh, to minister to him, and to love the name of Yahweh, to be his servants, everyone who keeps the Sabbath from profaning it, and holds fast my covenant;

Young's Literal Translation
And sons of the stranger, who are joined to Jehovah, To serve Him, and to love the name of Jehovah, To be to Him for servants, Every keeper of the sabbath from polluting it, And those keeping hold on My covenant.

Isaiah 56:6 Additional Translations ...