Shrimad Bhagavad Gita
विधिहीनमसृष्टान्नं मन्त्रहीनमदक्षिणम् । श्रद्धाविरहितं यज्ञं तामसं परिचक्षते ॥ १७-१३॥
They declare that sacrifice as 'done through tamas' which iscontrary to Shaastravidhi ( the ordinances of the scriptures ), in which no food is distributed, which is devoid of Mantras, gifts and faith.
english translation
शास्त्रविधिसे हीन, अन्न-दानसे रहित, बिना मन्त्रोंके, बिना दक्षिणाके और बिना श्रद्धाके किये जानेवाले यज्ञको तामस यज्ञ कहते हैं।
hindi translation
vidhihInamasRSTAnnaM mantrahInamadakSiNam । zraddhAvirahitaM yajJaM tAmasaM paricakSate ॥ 17-13॥
hk transliteration by Sanscript