Śrāddha-kalpa: Amarakantaka–Tīrtha-Māhātmya and Akṣaya Pitṛ-Tarpaṇa
यमुनाप्रभवे चैव सर्वपापैः प्रमुच्यते / अत्युष्णाश्चातिशीताश्च आपस्तस्मिन्निदर्शनम्
yamunāprabhave caiva sarvapāpaiḥ pramucyate / atyuṣṇāścātiśītāśca āpastasminnidarśanam
At the source of the Yamuna one is released from all sins; the waters there are at times exceedingly hot and at times exceedingly cold—this is its sign.