18.70 Ca, and; even he yah, who; adhyesyate, will study; imam, this; samvadam, conversation, the text in the form of a dialogue; between avayoh, us two; which is dharmyam, conducive to virtue, not divorced from virtue; tena, by him; this will be accomplished through that study; aham, I; syam, shall be; istah, adored; jnana-yajnena, through the Sacrifice in the form of Knowledge. Iti, this is me, My; matih, judgement. As compared with the various sacrifices, viz rituals, loud prayer, prayer uttered in a low voice and mental prayer, the Sacrifice in the from of Knowledge is the best [See 4.33.] because it is mental. Hence, the study of the scripture Gita is praised as that Sacrifice in the form of Knowledge. Or, this (verse) may merely be a judgement about the result. The idea is that the result of the study is comparable to the result of the Sacrifice in the form of the knowledge of gods and others. Now, this is the reward for the hearer:

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18.70 And he who will study this sacred conversation between us two, which is conducive to virtue, by him I shall be adored through the Sacrifice in the form of Knowledge. This is My judgement.