Isaiah 56:6

6 Also the foreigners who join themselves to the LORD, to minister to him, and to love the name of the LORD, to be his servants, everyone who keeps the Shabbat from profaning it, and holds fast my covenant;

Isaiah 56:6 In-Context

4 For thus says the LORD of the eunuchs who keep my Shabbatot, and choose the things that please me, and hold fast my covenant:
5 To them will I give in my house and within my walls a memorial and a name better than of sons and of daughters; I will give them an everlasting name, that shall not be cut off.
6 Also the foreigners who join themselves to the LORD, to minister to him, and to love the name of the LORD, to be his servants, everyone who keeps the Shabbat from profaning it, and holds fast my covenant;
7 even them will I bring to my holy mountain, and make them joyful in my house of prayer: their burnt offerings and their sacrifices shall be accepted on my altar; for my house shall be called a house of prayer for all peoples.
8 The Lord GOD, who gathers the outcasts of Yisra'el, says, Yet will I gather [others] to him, besides his own who are gathered.
The Hebrew Names Version is in the public domain.