द्रव्ययज्ञास्तपोयज्ञा योगयज्ञास्तथापरे |
स्वाध्यायज्ञानयज्ञाश्च यतय: संशितव्रता: || 28||
dravya-yajñās tapo-yajñā yoga-yajñās tathāpare
swādhyāya-jñāna-yajñāśh cha yatayaḥ sanśhita-vratāḥ
BG 4.28: Some offer their wealth as sacrifice, while others offer severe austerities as sacrifice. Some practice the eight-fold path of yogic practices, and yet others study the scriptures and cultivate knowledge as sacrifice, while observing strict vows.