Isaiah 56:6-8

6Also the foreigners who join themselves to Adonai, to minister to Him, and to love the Name of Adonai, and to be His servants— all who keep from profaning Shabbat, and hold fast to My covenant—

7these I will bring to My holy mountain, and let them rejoice in My House of Prayer. Their burnt offerings and sacrifices will be acceptable on My altar. For My House will be called a House of Prayer for all nations.”

8Adonai Elohim, who gathers the dispersed of Israel, declares, “I will gather still others to him, to those already gathered.”