Mahabharata 3.107.14

संवत्सरसहस्रे तु गते दिव्ये महानदीदर्शयामास तं गङ्गा तदा मूर्तिमती स्वयम्

saṃvatsarasahasre tu gate divye mahānadīdarśayāmāsa taṃ gaṅgā tadā mūrtimatī svayam

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