When all the leaders of Israel arrived, the priests picked up the Ark.
Then the priests and Levites took the Ark of the LORD, along with the Tabernacle and all its sacred utensils, and carried them up to the Temple.
References for 1 Kings 8:4
King Solomon and the entire community of Israel sacrificed sheep and oxen before the Ark in such numbers that no one could keep count!
Then the priests carried the Ark of the LORD's covenant into the inner sanctuary of the Temple -- the Most Holy Place -- and placed it beneath the wings of the cherubim.
The cherubim spread their wings over the Ark, forming a canopy over the Ark and its carrying poles.
These poles were so long that their ends could be seen from the front entrance of the Temple's main room -- the Holy Place -- but not from outside it. They are still there to this day.
Nothing was in the Ark except the two stone tablets that Moses had placed there at Mount Sinai, where the LORD made a covenant with the people of Israel as they were leaving the land of Egypt.
References for 1 Kings 8:9
As the priests came out of the inner sanctuary, a cloud filled the Temple of the LORD.
The priests could not continue their work because the glorious presence of the LORD filled the Temple.
Then Solomon prayed, "O LORD, you have said that you would live in thick darkness.
But I have built a glorious Temple for you, where you can live forever!"