Isaiah 56:3-4

3Neither let the son of the stranger, that hath joined himself to Yhwh, speak, saying, Yhwh hath utterly separated me from his people: neither let the eunuch say, Behold, I am a dry tree. 4For thus saith Yhwh unto the eunuchs that keep my sabbaths, and choose the things that please me, and take hold of my covenant;