Isaiah 56:6-7

“Some foreigners have chosen to follow the LORD. They do this so that they can serve him and love his name and be his servants. They keep the Sabbath as a special day of worship, and they will continue to follow closely my agreement. So I will bring them to my holy mountain and make them happy in my house of prayer. The offerings and sacrifices they give me will please me, because my Temple will be called a house of prayer for all nations.”