vṛkṣa-mūlam upāviśat

bhagavan-the Personality of Godhead; sva-atma-mayaya-by His internal potency; gatim-the end; tam-that; avalokya-foreseeing; sah-He (Krsna); sarasvatim-the River Sarasvati; upasprsya-after sipping water; vrksa-mulam-at the foot of a tree; upavisat-sat down.