John Gill Commentary 2 Chronicles 1:6

"And Solomon went up thither to the brazen altar before Jehovah, which was at the tent of meeting, and offered a thousand burnt-offerings upon it." — 2 Chronicles 1:6 (ASV)

And Solomon went up thither
To the high place at Gibeon:

to the brasen altar before the lord ;
where he used to be, and accept the sacrifices of his people, though the ark, the symbol of his presence, was not there:

which was at the tabernacle of the congregation ;
that is, which altar was there; or rather "who", that is, God, was there, as Osiander, hearing the prayers of his people, and accepting their offerings:

and offered a thousand offerings upon it ;
by the priests, see (1 Kings 3:4) .