Mahabharata 13.106.5

अतीत्य सुरलोकं च गवां लोकं च भारतऋषिलोकं च सोऽगच्छद्भगीरथ इति श्रुतिः

atītya suralokaṃ ca gavāṃ lokaṃ ca bhārataṛṣilokaṃ ca so'gacchadbhagīratha iti śrutiḥ

Our plain-language meaning of this verse is waiting for scholar review.