BG 17.13
विधिहीनमसृष्टान्नं मन्त्रहीनमदक्षिणम् ।
श्रद्धाविरहितं यज्ञं तामसं परिचक्षते ॥
श्रद्धाविरहितं यज्ञं तामसं परिचक्षते ॥
vidhi-hīnam asṛṣṭānnaṁ mantra-hīnam adakṣiṇam
śraddhā-virahitaṁ yajñaṁ tāmasaṁ paricakṣate
śraddhā-virahitaṁ yajñaṁ tāmasaṁ paricakṣate
Word-for-word meanings
yajñam — [that] yajña; vidhi-hīnam — [which] neglects scriptural injunctions; asṛṣṭa-annam — [which is] without distribution of food; mantra-hīnam — without chanting appropriate mantras; adakṣiṇam — without gifts to the priests; śraddhā-virahitam — [and] without faith; paricakṣate — is said to be; tāmasam — of the nature of tamas.
Translation
That yajña which neglects scriptural injunctions, in which no food is distributed, no mantras are chanted, no gifts are offered to the priests, and that is performed without faith, is said to be of the nature of tamas.