سورة سبإ

Ali ibn Ibrahim (may Allah have mercy on him): What is meant by أَنِ اعْمَلْ سَابِغَاتٍ [Make ample coats of mail] is coats of mail, and what is meant by وَ قَدِّرْ فِی السَّرْدِ [and assign a measure in the making] is the nails that are in the rings of the coat of mail.

Imam Rida (peace be upon him): It is narrated from Bazanti who said: I asked Imam Rida (peace be upon him): "Is any of your companions engaged in making weapons?" I said: "One of our companions is a [zarrad: maker of coats of mail]." The Imam said: "Rather, he is a [sarrad: maker of coats of mail]. Have you not read the words of Allah the Mighty and Majestic concerning Dawud (peace be upon him), where He says: أَنِ اعْمَلْ سَابِغَاتٍ وَ قَدِّرْ فِی السَّرْدِ [Make ample coats of mail, and assign a measure in the making]; that is: fit one ring after another to match."