The Hari-bhakti-vilasa cites the following quotation from Skanda Purana concerning the blaspheming of a Vaisnava:

In this conversation between Markandeya and Bhagiratha, it is said: "My dear King, if one derides an exalted devotee, he loses the results of his pious activities, his opulence, his reputation and his sons. Vaisnavas are all great souls. Whoever blasphemes them falls down to the hell known as Maharaurava. He is also accompanied by his forefathers. Whoever kills or blasphemes a Vaisnava and whoever is envious of a Vaisnava or angry with him, or whoever does not offer him obeisances or feel joy upon seeing a Vaisnava, certainly falls into a hellish condition."

In a conversation between Prahlada Maharaja and Bali Maharaja, it is said, "Those sinful people who blaspheme Vaisnavas, who are all great souls, are subjected very severely to the punishment offered by Yamaraja."

"One who criticizes Lord Visnu and His devotees loses all the benefits accrued in a hundred pious births. Such a person rots in the Kumbhipaka hell and is bitten by worms as long as the sun and moon exist. One should therefore not even see the face of a person who blasphemes Lord Visnu and His devotees. Never try to associate with such persons."

"If one does not immediately leave upon hearing the Lord or the Lord's devotee blasphemed, he falls down from devotional service." Similarly, Lord Siva's wife Sati states in Srimad-Bhagavatam (4.4.17):

"If one hears an irresponsible person blaspheme the master and controller of religion, he should block his ears and go away if unable to punish him. But if one is able to kill, then one should by force cut out the blasphemer's tongue and kill the offender, and after that he should give up his own life."