A great yajña.

मनुस्मृति states that respecting each of the following five is considered as a यज्ञ in itself:--A देवता , a guest, servants, parents and the self. Of these the first is called आहुत , second, हुत , third, प्रहुत , fourth ब्राह्म्यहुत and fifth, प्राशित (Ślokas 72. 73, Chapter 3, Manusmṛti) .