Srimad Bhagavatam - Sage Narada Curses Kubera's Sons
King Parikshit asks Sukhamuni “Why highly revered Sage Narada cursed Nalakubera and Manigriva? What reproachful act did they do?”.
Sukamuni said, “ The two sons of Kubera, despite being attendants of Lord Rudra, possessed uncontrollable passion, were fully drunk and strolling with women near river Mandakini.
The celestial Sage, who happened to pass by, saw the fully intoxicated Yakshas (demigods). The celestial nymphs who were naked hurriedly put on their clothes but sons of kubera, ignored the Sage, and remained unclothed.
Seeing the two sons of Kubera fully intoxicated and blind with pride of wealth, Sage Narada felt they needed to be rectified through a curse and to give an opportunity to correct themselves.
The Sage said, “A man with insatiable desires through wealth loses wisdom. With the pride of wealth (a product of Rajoguna), women, gambling, and liquor get associated.
This pride of wealth makes men kill animals mercilessly. This perishable body is food to worms when buried, food if killed by carnivorous animals, or as ashes if burnt. Why perpetrate violence for the sake of pampering such a body?
To whom does this body belong? One's father? mother? employer? maternal grandfather (on adoption)? King? Purchaser?
Hence, this body is a common property that exists from Primordial matter and will again go back into it. A fool alone identifies himself with the body.
Poverty is the best solution for a wicked soul blinded with pride of wealth. He who has his foot ever pricked with a thorn alone would never allow a fellow being to suffer such pain.
The hardship a poor man undergoes will prove to be his austerity in this life. A hungry man's body becomes feeble and desists from violence.
Hence, I shall take away their pride caused by ignorance , who are slaves of women, intoxicated and blinded with pride of wealth.
They deserve to be reduced to the state of a tree (that stands immobile, unbending, and uncovered) so that by my grace, they may not behave like that again.
In the presence of Srikrishna at the end of a hundred celestial years, they would acquire devotion and end their curse”. Saying so, the Sage went away to the hermitage of Narayana.
Nalkubera and Manigriva were transformed into two Arjuna trees sprung together at Vraja. Krishna crawled between the adjoined trees to make the prophecy of Sage Narada true.
Source: Bhagavatha Mahapurana