Kommentar zu Divrej Hajamim I 17:3

And it came to pass on that same night, etc. It is explained in the Midrash (Midrash Sam. 26: 1): “The Holy One, blessed be He, said to Nathan: This man to whom I am sending you is a vower. Go forth and tell him before he swears to build it: You shall not build Me the house for My dwelling.” Another explanation: The man to whom I am sending you is zealous. Go, tell him before he hires workers.