John Gill Commentary 1 Kings 6:19

"And he prepared an oracle in the midst of the house within, to set there the ark of the covenant of Jehovah." — 1 Kings 6:19 (ASV)

And the oracle he prepared in the house within
In the innermost part of the house he fitted up the oracle, or speaking place, from where the Lord spoke and gave answer, to receive what was to be put into it: particularly

to set there the ark of the covenant of the Lord ;
even the very same that Moses made, (Exodus 37:1–5) , for which David had pitched a tent in Zion, (1 Chronicles 15:1) , and where it now was; for Solomon made no new ark.