'Agni will declare to you another foot of Brahman.' (After these words of the bull), Satyakâma, on the morrow, drove the cows (toward the house of the teacher). And when they came towards the evening, he lighted a fire, penned the cows, laid wood on the fire, and sat down behind the fire, looking to the east.

In plain words: The bull says Agni, the fire, will teach him the next part. The next day Satyakama drives the cows on. In the evening he makes a fire, pens the cows, and sits by the fire facing east.