1 Chronicles 22:3-5

Living Bible

³ They also manufactured iron into the great quantity of nails needed for the doors in the gates and for the clamps; and they smelted so much bronze that it was too much to weigh. ⁴ The men of Tyre and Sidon brought great rafts of cedar logs to David.

⁵ “Solomon my son is young and tender,” David said, “and the Temple of the Lord must be a marvelous structure, famous and glorious throughout the world; so I will begin the preparations for it now.”

So David collected the construction materials before his death.