Daniel 5:10
Now the queen, by reason of the words of the king and his lords, came into the banquet house: and the queen spake and said, O king, live for ever: let not thy thoughts trouble thee, nor let thy countenance be changed:
Cross-reference
Daniel 5:6 describes Belshazzar's terror—his color changed and knees knocked—which prompts the queen's words of reassurance.
Daniel 2:3 records Nebuchadnezzar's troubled spirit from a dream — the precedent the queen uses to reassure Belshazzar here.
In Daniel 3:9, the same greeting 'O king, live forever!' is used by Chaldeans to Nebuchadnezzar, showing this is a standard courtly address.
In Daniel 6:6, the same greeting 'O king, live forever!' is used for Darius, reinforcing this formula for monarchs.
In Daniel 6:21, Daniel himself says 'O king, live forever!' to Darius, showing even a prophet uses this respectful greeting.
In 1 Kings 1:31, Bathsheba says 'May my lord King David live forever!' — a similar blessing for an Israelite king.
In 2 Samuel 16:16, Hushai greets Absalom with 'Long live the king!' — a parallel acclamation to the queen's wish.