shri bhagavan uvaca –
urdhva-mulam adhah shakham ashvattham prahur avyayam
chandamsi yasya parnani yas tam veda sa vedavit
Bhagavan Shri Krishna said: It has been told that there is an imperishable banyan tree that has its roots above, its branches below and its leaves are the Vedic mantras. One who knows this tree is the knower of the Vedas.