《资治通鉴·唐纪·唐纪十九》
于是开府库，令士曹参军李宗臣就线坊，驱囚徒、工匠授以甲。
于是开府库，令士曹参军李宗臣就钱坊，驱囚徒、工匠数百，授以甲。
So he opened the royal granary and ordered Li Zongchen, the military staff officer of the Scribes and Cadets, to go to the thread workshop to drive prisoners and craftsmen into service by giving them armor.