स्वाध्यायज्ञानयज्ञाश्च यतयः संशितव्रताः।।4.28।।
4.28 Others again offer wealth, austerity and Yoga as sacrifice, while the ascetics of self-restraint and rigid vows offer study of scriptures and knowledge as sacrifice.
4.28 Tatha, similarly; apare, others; are dravya-yajnah, perfomers of sacrifices through wealth-those sacrificers who spend wealth (dravya) in holy places under the idea of performing sacrifices; tapo-yajnah, performers of sacrifices through austerity, men of austerity, to whom austerity is a sacrifice; [This is according to Ast.-Tr.] yogayajnah, performers of sacrifice through yoga-those to whom the yoga consisting in the control of the vital forces, withdrawal of the organs, etc., is a sacrifice; and svadhyaya-jnana-yajnah, performers of sacrifices through study and knowledge. Sacrificers through study are those to whom the study of Rg-veda etc. accroding to rules is a sacrifice. And sacrificers through knowledge are those to whom proper understanding of the meaing of the scriptures is a sacrifice. Others are yatayah, ascetics, who are deligent; samsita-vratah, in following severe vows. Those whose vows (vratah) have been fully sharpened (samsita), made very rigid, are samsita-vratah. [Six kinds of sacrifices have been enumerated in this verse.] Further,
Dravyayajnaas tapoyajnaa yogayajnaastathaapare; Swaadhyaayajnaana yajnaashcha yatayah samshitavrataah.
dravya-yajñāḥ—offering one’s own wealth as sacrifice; tapaḥ-yajñāḥ—offering severe austerities as sacrifice; yoga-yajñāḥ—performance of eight-fold path of yogic practices as sacrifice; tathā—thus; apare—others; swādhyāya—cultivating knowledge by studying the scriptures; jñāna-yajñāḥ—those offer cultivation of transcendental knowledge as sacrifice; cha—also; yatayaḥ—these ascetics; sanśhita-vratāḥ—observing strict vows