Isaiah 56:6-7

6“Also the 1foreigners who join themselves to the Lord, To attend to His service and to love the name of the Lord, To be His servants, every one who 2keeps the Sabbath so as not to profane it, And holds firmly to My covenant;7Even 3those I will bring to My 4holy mountain, And 5make them joyful in My house of prayer. Their burnt offerings and their sacrifices will be acceptable on 6My altar; For 7My house will be called a house of prayer for all the peoples.”