Here is the Sanskrit anuvad, Hindi anuvad, and English translation of Purushottama Yoga Chapter 15, Verse 15.1.
Sanskrit
श्रीभगवानुवाच । ऊर्ध्वमूलमधःशाखमश्वत्थं प्राहुरव्ययम् छन्दांसि यस्य पर्णानि यस्तं वेद स वेदवित् ॥ …
Hindi
श्री भगवान् बोले —–आदिपुरुषपरमेश्वर रूप मूल वाले और ब्रह्मा रूप मुख्य शाखा वाले जिस संसार रूप पीपल के वृक्ष को अविनाशी कहते हैं, तथा वेद जिसक पत्ते कहे गये हैं —-उस संसार रूप वृक्ष को जो पुरुष मूल सहित तत्व से जानता है, वह वेद के तात्पर्य को जानने वाला है ।
English
The Dear Lord explained to Arjuna:O Arjuna, there exists an enormous, everlasting, and divinely pure tree known as the indestructable ASVAATTHAM (COSMIC TREE OF LIFE). The extraordinary things about this tree, is that it has its roots above at its peak and its branches are located at the lowest part of the tree. It’s pure, green leaves are the VEDAS (Holy Scriptures and Sacred Songs). He who believes and realizes this truth, also knows and understands the VEDAS.