מדרש אויף מלכים א 7:50

... Another explanation. “And all the work that king Solomon had wrought in the house of the Lord was finished.” (Melachim I 7:51) What does ‘all the work’ mean? It was built by itself, rising and floating up – thus it does not say when the house was built, but rather “And the house, when it was in building…” (Melachim I 6:7) “…was built of stone finished at the quarry (masa)…” (ibid.) What does ‘finished at the quarry’ (masa nivne) mean? R’ Brechia said: the stone picked itself up (nosah atzma), rose up and was built by itself. This is what Shlomo said in his song “I have surely built You a house to dwell in…” (Melachim I 8:13) He says ‘I have surely built’, meaning ‘I built a building and the stones rose up and flew into place themselves’. If you are shocked that the Holy One would do such a thing for a single righteous person, “And a stone was brought and placed on the mouth of the pit…” (Daniel 6:18) And where did they get a rock in Bavel? Our Rabbis said that it rolled all the way from the land of Israel and came in an instant. So if the Holy One did such a thing for flesh and blood, are you surprised that He would do so for the building of a house to the Holy One?

R. Akiva says: "saf" signifies a vessel, as in (I Kings 7:50) "And the 'sippoth' and the snuffers, and the basins and the spoons, etc."

R. Akiva says: "saf" is a vessel, as in (I Kings 7:50) "and the sippoth, and the snuffers, and the sprinkling bowls.