Shiva Purana
शिवदीक्षान्वितो भक्तो महाप्रसादसंज्ञकम् । सर्वेषामपि लिंगानां नैवेद्यं भक्षयेच्छुभम् ११ ।
The Naivedya of all phallic icons is called a great favour and is auspicious. A devotee after initiation into Śaiva cult shall eat it.
english translation
zivadIkSAnvito bhakto mahAprasAdasaMjJakam । sarveSAmapi liMgAnAM naivedyaM bhakSayecchubham 11 ।
hk transliteration by Sanscript