Narayaneeyam Dasakam: 48 -- Nalakubara and Manigriva
Nalakuvara and Maṇigriva were great devotees of Lord Śiva, but because of material opulence they became so extravagant and senseless that one day they were enjoying with naked girls in a lake and shamelessly walking here and there. Suddenly Nārada Muni passed by, but they were so maddened by their wealth and false prestige that even though they saw Nārada Muni present, they remained naked and were not even ashamed. In other words, because of opulence and false prestige, they lost their sense of common decency.
Therefore Narada Muni set an example by cursing these two persons, Nalakuvara and Maṇigriva, to become dull and unconscious like trees. This was a fit punishment. But because After mother Yaśodā bound Kṛiṣhṇa and became engaged in other household affairs, Kṛiṣhṇa observed two yamala-arjuna trees, which were actually Nalakūvara and Maṇigrīva, two sons of Kuvera who had been condemned by Nārada Muni to become trees. Kṛiṣhṇa by His mercy, now began to proceed toward the trees to fulfill the desire of Nārada Muni.is always merciful, even though they were punished they were fortunate enough to see the Supreme Personality of Godhead face to face. Nalakūvara and Maṇigrīva became twin arjuna trees and remained in the courtyard of mother Yaśodā and Nanda Mahārāja, waiting for the opportunity to see Kṛiṣhṇa directly. Lord Krishna by the desire of His devotee.
Sri Krishna moving the wooden grinding mortar ends when he pulls it through two trees that were standing close by in Vrindavan. The two trees were Nalakuvara and Manigriva who were cursed by Sage Narada to become trees. They got Moksha when Krishna pulled the two trees down using the wooden grinding mortar. , uprooted these yamala-arjuna trees, and when Nalakūvara and Maṇigrīva were thus delivered by Kṛiṣhṇa after one hundred years of the devas, their old consciousness revived, and they offered Kṛiṣhṇa prayers suitable to be offered by demigods. Having thus gotten the opportunity to see Kṛiṣhṇa face to face, they understood how merciful Nārada Muni was, and therefore they expressed their indebtedness to him and thanked him. Then, after circumambulating the Supreme Personality of Godhead Kṛiṣhṇa ,they departed for their respective abodes.