Īśnādhyuṣita (Isanadhyushita) is a tīrtha (tirtha; site of pilgrimage) near the river Sarasvatī (Sarasvati). In Vanaparva of Mahābhārata (Mahabharata), it is said that there was an ancient Aśvattha (Aswattha)tree on the bank of Sarasvatī. There was an anthill adjacent to its trunk. standing near that anthill, if a śamyā (samya a piece of wood, shaped like a stick) is thrown forcefully, six times at a stretch, it falls at a distance where is located Īśāna tīrtha, which is the abode of Rudra-Śiva (Siva). The root of the Aśvattha tree was wet, washed by the water of Sarasvatī. If a virtue-seeker takes a bath in this water oozing out of this place, he obtains the fruits of virtue equal tothat of donating a thousand black cows and performing Aśvamedha yajña, as it is described in Mahābhārata (Mahabharata). Īśānatīrtha is six-yaṣṭi (yashti)a kind of wooden stick) away from this place, and it is also a holy site.
plakṣaddevī srutā rājan puṇyādevī sarasvatī
tatrābhiṣekaṃ kurvīta valmīkānniḥsṛte jale.
arcayitvā pitṛn devānaśvamedhaphalaṃ labhet
īśānādhyuṣitaṃ nāma tatra tīrthaṃ sudurlabham                                                                                                                            ṣaṭṣu śamyānipāteṣu valmīkāditi niścayaḥ
kapilānāṃ sahasrañca vājimedhañca vindati.