wiesen asks:
Dear Rabbi Kornfeld and colleagues,
In the Shottenstein (Artscroll) edition, on page 87A1, footnote 12 says the 10 Commandments were written on sapphire tablets, What might be the source of that statement?
Toda raba,
Yehuda
The Kollel replies:
See Rashi to Shemos 34:1 and to Shir ha'Shirim 5:16, citing a Midrash. The Midrash is alluded to in the Gemara in Nedarim 38a (see the first Rosh there).
Best wishes,
Mordecai Kornfeld