Bhagavad Gita · Chapter 17: The Three Kinds of Faith

Bhagavad Gita 17.13

vidhihīnamasṛṣṭānnaṃ mantrahīnamadakṣiṇam | śraddhāvirahitaṃ yajñaṃ tāmasaṃ paricakṣate ||

A sacrifice that ignores the rules, in which no food is shared, no mantras are recited, no gift is made to the priests, and there is no faith, is called a sacrifice of inertia.

Modern context

A tamasic offering ignores proper form, shares no food, has no words of meaning, gives nothing to those who serve, and has no faith. It is done carelessly, as a dead habit. Notice that sharing food appears in this list. An offering that does not feed anyone has lost its point. True offering always overflows into generosity.