The door
pethach (peh'-thakh)
an opening (literally), i.e. door (gate) or entrance way -- door, entering (in), entrance (-ry), gate, opening, place.
for the middle
tiykown (tee-kone')
central -- middle(-most), midst.
chamber
tsela` (tsay-law')
beam, board, chamber, corner, leaf, plank, rib, side (chamber).
was in the right
ymaniy (yem-aw-nee')
right (i.e. at the right hand): -(on the) right (hand).
side
katheph (kaw-thafe')
arm, corner, shoulder(-piece), side, undersetter.
of the house
bayith (bah'-yith)
a house (in the greatest variation of applications, especially family, etc.)
and they went up
`alah (aw-law')
to ascend, intransitively (be high) or actively (mount); used in a great variety of senses, primary and secondary, literal and figurative (as follow)
with winding stairs
luwl (lool)
a spiral step -- winding stair.
into the middle
tiykown (tee-kone')
central -- middle(-most), midst.
chamber and out of the middle
tiykown (tee-kone')
central -- middle(-most), midst.
into the third
shliyshiy (shel-ee-shee')
third; feminine a third (part); by extension, a third (day, year or time); specifically, a third-story cell) -- third (part, rank, time), three (years old).