Isaiah 56:3-4

3And let not the son of the alien, that hath joined himself to Jehovah, speak saying, Jehovah hath entirely separated me from his people; neither let the eunuch say, Behold, I am a dry tree;

4for thus saith Jehovah: Unto the eunuchs that keep my sabbaths, and choose the things that please me, and hold fast to my covenant,