20 Even in thy thought thou must not curse a king; and in thy bed-chambers do not curse the rich; for a bird of the air can carry the sound, and that which hath wings can tell the word.
Ecclesiastes 10:20 Cross References - Leeser
Exodus 22:28
28 (22:27) The judges thou shalt not revile; and a ruler among thy people thou shalt not curse.
2 Kings 6:12
12 And one of his servants said, Not so, my Lord, O king; but Elisha’, the prophet that is in Israel, can tell unto the king of Israel the words that thou mayest speak in thy sleeping-chamber.
Ecclesiastes 7:21-22
Isaiah 8:21
21 And the people shall pass through the land, hard oppressed and hungry: and it shall come to pass, that when they shall be hungry, they will become enraged, and curse their king and their god, and turn toward on high for aid.