न हाप्सु प्रैत्यप्सुमान्भवति य एतदेवविद्वान्सर्वास्वप्सु पञ्चविध सामोपास्ते ॥इति चतुर्थ खण्ड ॥
In plain words
He who knows this and meditates upon the fivefold sāman in all waters never comes to harm in the waters; he becomes one who is sustained by the waters. Thus ends the fourth section.
Close to the Sanskrit
Not indeed does he go to harm in the waters, he becomes possessed of waters, who thus knowing this, meditates upon the fivefold sāman in all waters. Thus the fourth section.