isaiah 56:3 Neither let the son of the stranger, that hath joined himself to the LORD, speak, saying, The LORD hath utterly separated me from his people: neither let the eunuch say, Behold, I am a dry tree. - Free Bible Online

      3. God welcomes all believers, without distinction of persons, under the new economy (Ac 10:34, 35).
      joined . . . to . . . Lord-- (Nu 18:4, 7). "Proselytes."
      separated--Proselytes from the Gentiles were not admitted to the same privileges as native Israelites. This barrier between Jews and Gentiles was to be broken down (Eph 2:14-16).
      eunuch-- (Ac 8:27, &c.). Eunuchs were chamberlains over harems, or court ministers in general.
      dry tree--barren (compare Lu 23:31); not admissible into the congregation of Israel (De 23:1-3). Under the Gospel the eunuch and stranger should be released from religious and civil disabilities.

JFB.