Shiva Purana
शीर्णपर्णाशनैर्धीरः षण्मासं सम्बभूव सः ॥ षण्मासं वायुभक्षोऽभूत्षण्मासं जल बिन्दुभुक् ॥ ३३ ॥
The courageous devotee spent six months by eating withered leaves. The remaining six months he spent drinking drops of water or simply breathing.
english translation
zIrNaparNAzanairdhIraH SaNmAsaM sambabhUva saH ॥ SaNmAsaM vAyubhakSo'bhUtSaNmAsaM jala bindubhuk ॥ 33 ॥
hk transliteration by Sanscript