Another interpretation: this teaches that the Holy One, blessed be He, showed him the Temple built, destroyed, and rebuilt. "And he said, See, the smell of my son" (Genesis 27:27) - behold it is built, as you say, "My sweet-savor offerings shall you observe to bring near" (Numbers 28:2). "Like the smell of a field" - behold it is destroyed, as you say, "Zion shall be plowed as a field" (Micah 3:12, cf. Jeremiah 26:18). "Which the LORD has blessed" - behold it is built and made perfect in the time to come, as you say, "For there the LORD commanded the blessing, life forevermore" (Psalms 133:3).
The Scent of the Temple Built, Ruined, and Built Again
Yalkut Shimoni on Torah 115:13
דָּבָר אַחֵר מְלַמֵּד שֶׁהֶרְאָה לוֹ הַקָּדוֹשׁ בָּרוּךְ הוּא בֵּית הַמִּקְדָּשׁ בָּנוּי וְחָרֵב וּבָנוּי, וַיֹּאמֶר רְאֵה רֵיחַ בְּנִי הֲרֵי בָּנוּי, כְּמָה דְּאַתְּ אָמַר (במדבר כח, ב) "רֵיחַ נִיחֹחִי תִּשְׁמְרוּ לְהַקְרִיב". כְּרֵיחַ שָׂדֶה הֲרֵי חָרֵב, כְּמָה דְּאַתְּ אָמַר "צִיּוֹן שָׂדֶה תֵחָרֵשׁ". אֲשֶׁר בֵּרֲכוֹ ה', הֲרֵי בָּנוּי וּמְשֻׁכְלָל לְעָתִיד לָבֹא, כְּמָה דְּאַתְּ אָמַר, (תהלים קלג, ג) "כִּי שָׁם צִוָּה ה' אֶת הַבְּרָכָה חַיִּים עַד הָעוֹלָם".