Brahma wanted to check if Krishna is really the Supreme God. Therefore, once when Krishna, along with his cowherd boy friends and the calves, went for a picnic with in the forest, Brahma stole all the calves and cowherd boys and hid them. To prove his supremacy, Krishna immediately expanded himself to become exactly like the boys and the calves, which were of all different bodily features. A later when Brahma returned, he saw that all the boys and calves were playing with Krishna in the same way as earlier. Then the calves and boys transformed into Vishnu forms with four hands. Thus, Brahma could understand Krishna’s potency.