Gita 15.1
श्रीभगवानुवाच। ऊर्ध्वमूलमधःशाखमश्वत्थं प्राहुरव्ययम्। छन्दांसि यस्य पर्णानि यस्तं वेद स वेदवित्॥
śrī-bhagavān uvāca ūrdhva-mūlam adhaḥ-śākham aśvatthaṁ prāhur avyayam chandāṁsi yasya parṇāni yas taṁ veda sa veda-vit
"The Blessed Lord said: They speak of an imperishable ashvattha tree with roots above and branches below, whose leaves are the Vedas. One who knows it is a knower of the Vedas."