《北史·列传·卷六十四》
到了华阴，发掘杨素墓冢，焚烧其尸骸遗骨，将其祖茔铲平，向士卒显示必死的决心。
至华阴，掘杨素冢，焚其骸骨，夷其茔域，示士卒以必死。
When he reached Huayin, he exhumed the tomb of Yang Su, burnt his remains and bones, and razed his ancestors' graveyard to the ground, in order to display his determination for his soldiers to fight to the death.