Isaiah 56:6

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 , everyone who keeps the Sabbath and does not profane it, and holds fast my covenant —

And foreigners who bind 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 desecrating it and who hold fast to my covenant—

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;