Once the Yadava boys mocked some exaled sages by dressing up Sāmba as a pregnant ginland asking them ifher child would be a boy or a girl. The sages cursed them that the "child" would be an iron club that would destroy their whole dynasty. Upon hearing the curse, the terrified boys quickly uncovered the belly of Sāmba, and they indeed saw an iron club.
The boys lamented, "Oh, what have we done? We are so unfortunate! What will our family members say to us?" Very disturbed, the luster of their façes completely faded, they brought the club into the royal assembly, and in the presence of all the Yadavas they told King Ugrasena what had happened. When the Yadus heard of the infallible curse of the brāhmaṇas and saw the club, they were astonished and distraught with fear.
After having the club ground to bits, King Ugrasena personally threw the pieces, along with the remaining lump of iron, into the sea. A fish swallowed the iron lump, while the bits of iron, carried back to the shore by the waves, implanted themselves there and grew into tall, sharp canes. Later the fish was caught in a fisherman's net. The hunter Jarā took the iron lump from the fish's stomach and fashioned it into a sharp arrowhead
Fully knowing the significance of all these events, Lord Kṛṣṇa, though capable of reversing the brāhmaṇas' curse, did not do so. Rather, He gladly sanctioned the events.
AND DHṚTI-DEVĪ DĀSĪ