Ezekiel 42:6-8

Young's Literal Translation

⁶ for they [are] threefold, and they have no pillars as the pillars of the court, therefore it hath been kept back -- more than the lower and than the middle one -- from the ground.

⁷ As to the wall that [is] at the outside, over-against the chambers, the way of the outer-court at the front of the chambers, its length [is] fifty cubits;

⁸ for the length of the chambers that [are] to the outer court [is] fifty cubits, and of those on the front of the temple a hundred cubits.