淨名經集解關中疏 2.489

2.489

'Whoever copies and preserves this scroll of the sūtra should know that their room has a Tathāgata.' Because the sūtra is the mother of the Buddhas, wherever the sūtra-scroll abides, the Buddhas, their disciples, Brahmā, Śakra, the nāgas, and the devas protect it like a stūpa.