"And he looked, and behold, a ram." Rabbi Eliezer says: it came from the mountains, where it had been grazing. Rabbi Yehoshua said: an angel brought it from the Garden of Eden, and it had been grazing beneath the Tree of Life and drinking from the waters that flow beneath it, and the fragrance of the ram wafted through all the world. And when was it placed in the Garden? At twilight of the six days of creation.
Where the Ram Came From and the Fragrance of Eden
Yalkut Shimoni on Torah 101:6
וַיַּרְא וְהִנֵּה אַיִל רַבִּי אֱלִיעֶזֶר אוֹמֵר, מִן הֶהָרִים בָּא, שֶׁהָיָה רוֹעֶה שָׁם. רַבִּי יְהוֹשֻׁעַ אָמַר, מַלְאָךְ הֵבִיאוֹ מִגַּן עֵדֶן, וְתַחַת עֵץ הַחַיִים הָיָה רוֹעֶה וְשׁוֹתֶה מִן הַמַּיִם שֶׁעוֹבְרִין תַּחְתָּיו, וְהָיָה רֵיחוֹ שֶׁל אַיִל נוֹדֵף בְּכָל הָעוֹלָם. וְאֵימָתַי נִתַּן בַּגַּן בֵּין הַשְּׁמָשׁוֹת שֶׁל שֵׁשֶׁת יְמֵי בְּרֵאשִׁית.