The sacrifice that is offered according to rules, by those who do not desire fruit, thinking ‘must be sacrificed’ with mind established — that is sāttvika.

Sāttvika sacrifice: aphalākāṅkṣibhiḥ — by those who do not desire fruit. Vidhi-dṛṣṭaḥ — according to what is seen/regulated in the vidhi (precept). Ijyate — is offered, is worshipped.

Attitude: yaṣṭavyam eva — “must be sacrificed” simply, as duty, not for gain. Manaḥ samādhāya — with mind established, fixed. This is pure karma-yoga — right action from duty, without attachment to result.