藥師經疏 1.28

1.28

經。厭魅蠱道至及壞其身　二起屍厭魅。謂互起身業更相殺害。此中雖復呪起屍鬼並是語業。此之語業但為表成壞身命業。

Sūtra: Sorcery, gu poisons [...] to [...] and destroy their bodies. Second, raising corpses and sorcery. This means mutually giving rise to bodily karma to slaughter each other. Herein, although chanting spells to raise vetālas is vocal karma, this vocal karma merely serves to manifest and accomplish the karma of destroying life and body.