Bhagavad Gita Chapter 17 Verse 13 भगवद् गीता अध्याय 17 श्लोक 13 विधिहीनमसृष्टान्नं मन्त्रहीनमदक्षिणम्। श्रद्धाविरहितं यज्ञं तामसं परिचक्षते।।17.13।। हिंदी अनुवाद - स्वामी रामसुख दास जी ( भगवद् गीता 17.13) ।।17.13।।शास्त्रविधिसे हीन? अन्नदानसे रहित? बिना मन्त्रोंके? बिना दक्षिणाके और बिना श्रद्धाके किये जानेवाले यज्ञको तामस यज्ञ कहते हैं। Rudra Vaishnava Sampradaya - Commentary Furthermore Lord Krishna states that rituals contrary to the Vedic scriptures meaning those which are forbidden and prohibited in the Vedic scriptures as well as ceremonies not endorsed by the Vedic scriptures meaning all those where the ordinances and injunctions of the Vedic scriptures are not observed; both are irrevocably locked in tama guna the mode of ignorance. Whatever religious activity or ritual that is enacted anywhere in creation, if it is devoid of duly initiated Vaisnavas and brahmanas chanting prescribed Vedic mantras, if it is devoid of propitiation and worship to the Supreme Lord Krishna or any of His authorised incarnations as revealed in Vedic scriptures and if it is devoid of faith in the Supreme Lord Krishna it is known to be irrefutably and irrevocably situated in the inertia of tama guna. Brahma Vaishnava Sampradaya - Commentary Shri Vaishnava Sampradaya - Commentary Any religious ritual or ceremony of any kind that is vidhi-hinam or devoid of following the ordinances and injunctions of the Vedic scriptures and without being conducted by Vaisnavas and brahmanas who are pre-eminent both in precept and in practice is recognizably known to be fully situated in tama guna the mode of ignorance. The words asrsta-annam means without the sanctified food and ingredients required to perform a bonafide yagna or propitiation and worship. The prohibition is that no ingredient may be acquired from those without faith in Lord Krishna; so it is a mandatory requirement that all ingredients are to be received only from devotees. Those situated in tama guna cannot fulfil this mandate. So in conclusion whatever religious activity that is performed without adhering to the authority of the Vedic scriptures, without Vaisnavas and brahmanas chanting Vedic mantras and without adoration of the Supreme Lord Krishna or any of His authorised incarnations and expansions is not valid and being bogus is totally situated in tama guna. If such activities were anyway somehow or other able to be clandestinely orchestrated by unqualified schemers it would still have no efficacy due to the absence of devotion to Lord Krishna and lack of faith in the absolute authority of the Vedic scriptures. Kumara Vaishnava Sampradaya - Commentary Any religious ritual or ceremony of any kind that is vidhi-hinam or devoid of following the ordinances and injunctions of the Vedic scriptures and without being conducted by Vaisnavas and brahmanas who are pre-eminent both in precept and in practice is recognizably known to be fully situated in tama guna the mode of ignorance. The words asrsta-annam means without the sanctified food and ingredients required to perform a bonafide yagna or propitiation and worship. The prohibition is that no ingredient may be acquired from those without faith in Lord Krishna; so it is a mandatory requirement that all ingredients are to be received only from devotees. Those situated in tama guna cannot fulfil this mandate. So in conclusion whatever religious activity that is performed without adhering to the authority of the Vedic scriptures, without Vaisnavas and brahmanas chanting Vedic mantras and without adoration of the Supreme Lord Krishna or any of His authorised incarnations and expansions is not valid and being bogus is totally situated in tama guna. If such activities were anyway somehow or other able to be clandestinely orchestrated by unqualified schemers it would still have no efficacy due to the absence of devotion to Lord Krishna and lack of faith in the absolute authority of the Vedic scriptures.