Holyname against Ghosts & Demons

It is said that a ghost cannot remain as soon as the holy name of the Lord is chanted. The great saints and devotees of the Lord are in the list of His paraphernalia, and thus as soon as a saintly devotee is present, the ghostly sins are at once vanquished. That is the verdict of all Vedic literatures. One is recommended, therefore, to associate only with saintly devotees so that worldly demons and ghosts cannot exert their sinister influence.

(SB 1.19.34 - Purport)