Jeremiah 38:16

So Zedekiah the king sware secretly unto Jeremiah, saying, As the Lord liveth, that made us this soul, I will not put thee to death, neither will I give thee into the hand of these men that seek thy life.

Cross-reference

Jeremiah 38:1-6 sets the scene: officials plot to kill Jeremiah, leading to Zedekiah's secret oath in verse 16.

Jeremiah 37:17 records another secret meeting where Zedekiah privately consults Jeremiah — same dynamic of secrecy and fear.

1 Samuel 20:3 uses the same 'as surely as the LORD lives' oath — David also facing death, showing a common biblical oath formula.

John 3:2 describes Nicodemus coming to Jesus at night — a secret consultation like Zedekiah's here.