Isaiah 56:6 in the King James Version
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;
Context
5 I will give them in my house and within my walls a memorial and a name better than of sons and of daughters. I will give them an everlasting name that will not be cut off.
6 Also the foreigners who join themselves to the LORD to serve him, and to love the LORD’s name, to be his servants, everyone who keeps the Sabbath from profaning it, and holds fast my covenant,
7 I will bring these to my holy mountain, and make them joyful in my house of prayer. Their burnt offerings and their sacrifices will be accepted on my altar; for my house will be called a house of prayer for all peoples.”