Earliest Example of Exegetical Kabbalah

And afterward they brought the stones as commanded in the Torah, and they built the altar and plastered it with plaster, and they wrote on it all of the words of the Torah in seventy languages, as it is stated: “And you shall write on the stones all the words of this law clearly elucidated” (Deuteronomy 27:8), indicating that it was to be written in every language. And they then took the stones from there and came to Gilgal and slept in their lodging place.   כָּל דִּבְרֵי הַתּוֹרָה בְּשִׁבְעִים לָשׁוֹן, שֶׁנֶּאֱמַר (שם) בַּאֵר הֵיטֵב, 

Baal HaTurim notes that “HaTorah hazot baeir heiteiv” in gematria adds up to 1258, as does “gam beshiv'im