The fourth Yajna is Nriyajna, which means to worship the entire humanity. The word 'Nri' means human. To worship the humans, to serve them, take care of them if they are in grief, pain or sorrow. To work hard for the well being and peace of the entire humanity is Nriyajna.
The other Yajnas of the five Yajnas are Brahma Yajna, Devayajna, Pitri Yajna and Bhuta Yajna.
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