Skanda Purana 5.14.17

5.14.17

vinā snānena bhakṣācca daivāddvijavarottamāḥ ..
tataḥ kāle vyatikrāṃte kiyanmātre svakarmataḥ ..
ubhau paṃcatvamāpannau pṛthaktvenāyuṣaḥ kṣaye .. 17 ..

without bathing or eating, by fate, O best of excellent brahmins. / Then, after a certain amount of time had passed in accordance with their own karma, / both met their death separately at the expiration of their life span.