Srimad Bhagvata Mahapurana: Book 10: Chapter 67: Verses 16-28
Observing such defiant attitude of his and remembering how he made havoc of the country, Balarama got enraged and took up (His weapons) the pestle and plough with intent to kill him. Dwivida also, being very powerful, lifted up a sal tree with one hand and rushing with (great) vehemence, hit Balarama with it on His head. The mighty Balarama, however, remained immovable like a rock and, holding up with one hand the tree even as it came flying towards his head, struck the monkey with His pestle called Sunanda. With his brain crushed by the pestle and covered with a stream of blood, Dwivida shone like a mountain covered with a solution of red chalk. But, unmindful of the stroke, he in extreme rage pulled out yet another tree and, removing all its leaves, hit Balarama with it violently. Balarama split the tree into a hundred pieces. The monkey struck Balarama with another in great rage; but the latter split that too into a hundred pieces. Thus he fought on. Each time a tree was smashed (by Balarama), the monkey pulled out another. (Thus) uprooting the trees (one by one) he denuded the forest of its trees on all sides. The enraged monkey thereupon began to rain slabs of stone on Balarama; but these also the latter, as a matter of sport, reduced to powder with His pestle. (Finally) clenching his arms, which were as long as a palm tree, the great monkey went up to Balarama and struck Him on the chest with both his fists.
(Thereupon) the Lord of the Yadus set aside His pestle and plough and, full of rage, hit him with both His hands on the collar-bone, and the latter fell down (dead) vomiting blood. Pariksit, like a ship rocking in water through the action of wind, the (whole) mountain with its peaks and trees shook as the monkey fell. In the heavens the gods raised shouts of victory, the Siddhas uttered greetings and great sages loudly said, 'Well done, Well done!' and they all showered flowers on Balarama. Having thus put an end to Dwivida, who had been desolating the land, Lord Balarama returned to Dwaraka (His own city) amidst the praises and acclamations of the people.
Thus ends the sixty-seventh discourse entitled "Dwivida killed (by Balarama)," in the latter half of Book Ten of the great and glorious Bhagavata-Purana,otherwise known as the Paramahamsa-Samhita..