stranger. foreigner. Hebrew. nakar. See Proverbs 5:3.
speak. think.
Behold. Figure of speech Asterismos.
Related Commentaries of Isaiah 56:3
Isaiah 56:3
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.