SB 10.13 Summary
This chapter describes Lord Brahmā's attempt to take away the calves and cowherd boys, and it also describes the bewilderment of Lord Brahmā and finally the clearance of his illusion.
Although the incident concerning Aghāsura had been performed one year before, when the cowherd boys were five years old, when they were six years old they said, "It happened today." What happened was this. After killing Aghāsura, Kṛṣṇa, along with His associates the cowherd boys, went for a picnic within the forest. The calves, being allured by green grasses, gradually went far away, and therefore Kṛṣṇa's associates became a little agitated and wanted to bring back the calves. Kṛṣṇa, however, encouraged the boys by saying, "You take your tiffin without being agitated. I shall go find the calves." And thus the Lord departed. Then, just to examine the potency of Kṛṣṇa, Lord Brahmā took away all the calves and cowherd boys and kept them in a secluded place.
When Kṛṣṇa was unable to find the calves and boys, He could understand that this was a trick performed by Brahmā. Then the Supreme Personality of Godhead, the cause of all causes, in order to please Lord Brahmā, as well as His own associates and their mothers, expanded Himself to become the calves and boys, exactly as they were before. In this way, He discovered another pastime. A special feature of this pastime was that the mothers of the cowherd boys thus became more attached to their respective sons, and the cows became more attached to their calves. After nearly a year, Baladeva observed that all the cowherd boys and calves were expansions of Kṛṣṇa. Thus He inquired from Kṛṣṇa and was informed of what had happened.
When one full year had passed, Brahmā returned and saw that Kṛṣṇa was still engaged as usual with His friends and the calves and cows. Then Kṛṣṇa exhibited all the calves and cowherd boys as four-armed forms of Nārāyaṇa. Brahmā could then understand Kṛṣṇa's potency, and he was astonished by the pastimes of Kṛṣṇa, his worshipable Lord. Kṛṣṇa, however, bestowed His causeless mercy upon Brahmā and released him from illusion. Thus Brahmā began to offer prayers to glorify the Supreme Personality of Godhead.