"The shamir was the seventh of the ten marvels created in the evening twilight of the first Friday (Ab. v. 6; comp. Pes. 54a; Sifre, Deut. 355; Mek., Beshallaḥ, 5 [ed. Weiss, p. 59b; ed. Friedmann, p. 51a]), and it was followed, significantly enough, by the creation of writing, the stylus, and the two tables of stone. Its size was that of a grain of barley; it was created after the six days of creation. Nothing was sufficiently hard to withstand it; when it was placed on stones they split in the manner in which the leaves of a book open; and iron was broken by its mere presence. The shamir was wrapped for preservation in spongy balls of wool and laid in a leaden box filled with barley bran."