Shiva Purana

siva.sh/siva-purana/uma-samhita/19/23

अनंतस्य न तस्यास्ति संख्यापि परमात्मनः ।। तेनानंत इति ख्यातः प्रमाणं नास्ति वै यतः ।। २३।।

sanskrit

There is no number of Him who is infinite and the Supreme Soul. That is why he is known as Infinite because there is no proof.

english translation

anaMtasya na tasyAsti saMkhyApi paramAtmanaH || tenAnaMta iti khyAtaH pramANaM nAsti vai yataH || 23||

hk transliteration by Sanscript