Isaiah 56:6-7

And the foreigners who join themselves to Yahweh to serve him and to love the name of Yahweh, to become his servants, every one who keeps the Sabbath, so as not to profane it, and those who keep hold of my covenant, I will bring them to my holy mountain; I will make them merry in my house of prayer. their burnt offerings and their sacrifices will be accepted on my altar, for my house shall be called a house of prayer for all peoples,”