Isaiah 56:6-7

MLV(i) 6 Also the foreigners who join themselves to Jehovah, to minister to him and to love the name of Jehovah, to be his servants, everyone who keeps the Sabbath from profaning it and holds fast my covenant, 7 even them I will bring to my holy mountain and make them joyful in my house of prayer. Their burnt offerings and their sacrifices will be accepted upon my altar, for my house will be called a house of prayer for all peoples.