Skandapurana 6.3.239.30

6.3.239.30

saṃnyasenniyamenānnaṃ saṃnyasedviṣayādikam .
phalamūlādikaṃ caiva jalamekaṃ na saṃtyajet .. 184.30 ..

One should strictly renounce food, one should renounce objects of sense and the like, / As well as fruits, roots, and the like; one should not abandon water alone.