Isaiah 56
2 Ref Blessed is the man who does this, and the son of man who holds it fast; who keeps the Sabbath from profaning it, and keeps his hand from doing any evil.
3 Ref Neither let the foreigner, who has joined himself to Yahweh, speak, saying, Yahweh will surely separate me from his people; neither let the eunuch say, Behold, I am a dry tree.
4 Ref For thus says Yahweh of the eunuchs who keep my Sabbaths, and choose the things that please me, and hold fast my covenant: