Isaiah 36:21
"But they held their peace, and answered him not a word: for the king’s commandment was, saying, Answer him not."
Cross References (ranked by relevance)
Answer not a fool according to his folly, lest thou also be like unto him.
I said, I will take heed to my ways, that I sin not with my tongue: I will keep my mouth with a bridle, while the wicked is before me.
Therefore the prudent shall keep silence in that time; for it is an evil time.
Then said Eliakim the son of Hilkiah, and Shebna, and Joah, unto Rabshakeh, Speak, I pray thee, to thy servants in the Syrian language; for we understand it: and talk not with us in the Jews’ language in the ears of the people that are on the wall.
Then came Eliakim the son of Hilkiah, which was over the household, and Shebna the scribe, and Joah the son of Asaph the recorder, to Hezekiah with their clothes rent, and told him the words of Rabshakeh.
Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.