Isaiah 56:6

Also the foreigners who join themselves to Yahweh to serve him, and to love Yahweh’s name, to be his servants, everyone who keeps the Sabbath from profaning it, and holds fast 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;