For the abhiṣeka (ritual bath) of Lord Pārśvanātha, the 23rd Tīrthaṅkara in Jainism, devotees often recite specific mantras. The most commonly recited mantra during the abhiṣeka is the Parshvanath Namokar Mantra or a specific Parshvanath Abhisheka Mantra. Here is a traditional abhisheka mantra dedicated to Lord Parshvanath:

ॐ ऋं क्षं ह्रीं श्रीं अर्हं नमः श्री पार्श्वनाथाय नमः। Om Rim Ksham Hreem Shreem Arham Namah Shri Parshvanathaya Namah.

This mantra is chanted while performing the abhisheka, usually with water, milk, or other sacred substances, as an act of devotion and purification.

You may also chant the universal Namokar Mantra (Navkar Mantra):

णमो अरिहंताणं, णमो सिद्धाणं, णमो आयरियाणं, णमो उवज्झायाणं, णमो लोए सव्वसाहूणं।

Translation: I bow to Arihants (enlightened beings), I bow to Siddhas (liberated souls), I bow to Acharyas (head of the order), I bow to Upadhyays (teachers), I bow to all Sadhus (saints) in the world.

During the abhisheka, it is common to recite the Parshvanath mantra multiple times, followed by the Namokar Mantra, as a way to invoke blessings and express devotion.

Please note: The exact practice and mantras may vary based on Jain sect (Śvetāmbara, Digambara) and local tradition. Always consult your local Jain temple or spiritual leader for precise rituals.