Melachim Alef 6:15-17

Orthodox Jewish Bible

¹⁵ And he built the walls of the Beis [Hamikdash] within with boards of cedar, from the floor of the Beis [Hamikdash] to the rafters of the ceiling; and he covered them on the inside with wood, and covered the floor of the Beis [Hamikdash] with planks of cypress.

¹⁶ And he built twenty cubits on the sides of the Beis [Hamikdash], from the floor to the rafters with boards of cedar; he even built them for it within, even for the Debir, even for the Kodesh HaKodashim.

¹⁷ And the Beis, that is, the Heikhal in front of it, was forty cubits long.