Kings IV 19:6

6 And Esaias said to them, Thus shall ye say to your master, Thus saith the Lord, Be not afraid of the words which thou hast heard, wherewith the servants of the king of the Assyrians have blasphemed.

Kings IV 19:6 In-Context

4 Peradventure the Lord thy God will hear all the words of Rapsakes, whom the king of Assyria his master has sent to reproach the living God and to revile him with the words which the Lord thy God has heard: and thou shalt offer prayer for the remnant that is found.
5 So the servants of king Ezekias came to Esaias.
6 And Esaias said to them, Thus shall ye say to your master, Thus saith the Lord, Be not afraid of the words which thou hast heard, wherewith the servants of the king of the Assyrians have blasphemed.
7 Behold, I send a blast upon him, and he shall hear a report, and shall return to his own land; and I will overthrow him with the sword in his own land.
8 So Rapsakes returned, and found the king of Assyria warring against Lobna: for he heard that he departed from Lachis.

The Brenton translation of the Septuagint is in the public domain.