The word of the Lord came to me ... - Not by Nathan (1 Chronicles 17:4–15), but on some other occasion ([Reference 1 Chronicle…

David gives formal charge to Solomon to build the Temple.

Then he called for Solomon his son, and charged him to build a house for the LORD GOD of Israel. And David said to Solomon, My son, as for me, …

But the word of the Lord came to me
The word of prophecy, as the Targum, by the mouth of Nathan the prophet:

David gives Solomon the reason why he should build the temple. It was because God had named him. Nothing is more powerful to engage us in any servi…