Bhagavad Gita Chapter 17 Verse 13
भगवद् गीता अध्याय 17 श्लोक 13

विधिहीनमसृष्टान्नं मन्त्रहीनमदक्षिणम्।
श्रद्धाविरहितं यज्ञं तामसं परिचक्षते।।17.13।।



English Translation - Swami Gambirananda
17.13 They declare that sacrifice as done through tamas which is contrary to injunction, in which food is not distributed, in which mantras are not used, in which offerings are not made to priests, and which is devoid of faith.


English Translation of Ramanuja's Sanskrit Commentary
17.13 They say that sacrifice is Tamasa, which is bereft of the authority of injunction of Brahmanas of learning and good conduct as Do this sacrifice, which is Asrstanna viz., which uses offerings (materials) not sanctioned by the Sastras; which is performed without recitation of hymns; and which is bereft of gifts and faith.

Now, to explain the threefold division of austerities according to their source in the Gunas, Sri Krsna describes their differences in respect of the body, speech and mind:


Transliteration Bhagavad Gita 17.13Vidhiheenam asrishtaannam mantraheenam adakshinam;
Shraddhaavirahitam yajnam taamasam parichakshate.


Word Meanings Bhagavad Gita 17.13vidhi-hīnam—without scriptural direction; asṛiṣhṭa-annam—without distribution of prasādam; mantra-hīnam—with no chanting of the Vedic hymns; adakṣhiṇam—with no remunerations to the priests; śhraddhā—faith; virahitam—without; yajñam—sacrifice; tāmasam—in the mode of ignorance; parichakṣhate—is to be considered