God Speaks without a Word.

I Kings 8:6 Then the priests brought the ark of the covenant of the Lord to its place in the inner sanctuary of the house, in the Most Holy Place, underneath the wings of the cherubim. 7 For the cherubim spread out their wings over the place of the ark, so that the cherubim overshadowed the ark and its poles. 8 And the poles were so long that the ends of the poles were seen from the Holy Place before the inner sanctuary; but they could not be seen from outside. And they are there to this day. 9 There was nothing in the ark except the two tablets of stone that Moses put there at Horeb, where the Lord made a covenant with the people of Israel, when they came out of the land of Egypt. 10 And when the priests came out of the Holy Place, a cloud filled the house of the Lord, 11 so that the priests could not stand to minister because of the cloud, for the glory of the Lord filled the house of the Lord.

The one main thing David left undone as king was keep his promise to build a permanent temple for God. This his left for Solomon.  We find no direct revelation from God reminding Solomon to do this, only his references to David's promise as he was building it. Finally, when it was completed, and all the other furnishings brought in, the Ark of the Covenant was brought in. Solomon said a lot; all God had to do to answer in approval was fill the Temple with His glory. It was the strongest, most appropriate word to say. Often God speaks powerfully without words; we know it's him because of our history with Him.