Shiva Purana
ततस्तत्र च शुद्धात्मा पञ्चधा परिकल्पितम्॥ भैक्ष्यं यथोचितं कुर्य्याद्दूषितान्नं विवर्ज्जयेत् ॥ ३१ ॥
He shall divide the alms into five parts and do with them as proper. He shall avoid defiled food.
english translation
tatastatra ca zuddhAtmA paJcadhA parikalpitam॥ bhaikSyaM yathocitaM kuryyAddUSitAnnaM vivarjjayet ॥ 31 ॥
hk transliteration by Sanscript