Śrāddha-kalpa: Amarakantaka–Tīrtha-Māhātmya and Akṣaya Pitṛ-Tarpaṇa
दुष्प्रयुक्ता हि पितृषु सुप्रयोगा भवन्त्युत / पितॄणां दुहिता पुण्या नर्मदा सरितां वरा
duṣprayuktā hi pitṛṣu suprayogā bhavantyuta / pitṝṇāṃ duhitā puṇyā narmadā saritāṃ varā
Even offerings wrongly performed for the Pitṛs become rightly performed there; Narmadā, the holy daughter of the Pitṛs, is the finest among rivers.