Shiva Purana
न चायुक्तकरे दद्यान्नैवाशुचितले क्षिपेत् ॥ न संस्पृशेच्च नीचांगैर्नोपेक्षेत न लंघयेत् ॥ ५९ ॥
It should not be placed in a proper hand or thrown on an unclean surface. He should not touch the lower parts of the body nor ignore them nor cross them.
english translation
na cAyuktakare dadyAnnaivAzucitale kSipet ॥ na saMspRzecca nIcAMgairnopekSeta na laMghayet ॥ 59 ॥
hk transliteration by Sanscript