Mbh 5.29.1g

Duryodhana is a big tree of evil passions; Karna is its trunk; Sakuni is its branches; Dussasana forms its abundant blossoms and fruits; (while) the wise king Dhritarashtra is its roots. Yudhishthira is a big tree of righteousness; Arjuna is its trunk; and Bhima is its branches; the sons of Madri are its abundant flowers and fruits; and its roots are myself and religion and religious men. King Dhritarashtra with his sons constitutes a forest, while, O Sanjaya, the sons of Pandu are its tigers. Do not, oh, cut down the forest with its tigers, and let not the tigers be driven away from the forest. The tiger, out of the woods, is easily slain; the wood also, that is without a tiger, is easily cut down. Therefore, it is the tiger that protects the forest and the forest that shelters the tiger. The Dhritarashtras are as creepers, while, O Sanjaya, the Pandavas are Sala trees. A creeper can never flourish unless it hath a large tree to twine round. The sons of Pritha are ready to wait upon Dhritarashtra as, indeed, those repressors of foes are ready for war. Let king Dhritarashtra now do what may be proper for him to do. The virtuous and the high-souled sons of Pandu, though competent to be engaged in fight, are yet now in place (with their cousins). O learned man, represent all this truly (to Dhritarashtra).’”