The Personality of Godhead, Lord Śrī Kṛṣṇa, after foreseeing the end [of His family] by His internal potency, went to the bank of the river Sarasvatī, sipped water, and sat down underneath a tree.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
भगवान् स्वात्ममायाया गतिं तामवलोक्य सः । सरस्वतीमुपस्पृश्य वृक्षमूलमुपाविशत्
bhagavān svātmamāyāyā gatiṃ tāmavalokya saḥ | sarasvatīmupaspṛśya vṛkṣamūlamupāviśat
SB 3.4.3