Matsyapurana 128.14

128.14

tasmāttāmrā bhavantyāpo divārātripraveśanāt
astaṃ gate punaḥ sūrye aharvai praviśaty apaḥ //

Therefore, the waters become copper-red by day from the entrance of the night. / But when the sun goes to set, day indeed enters the waters;