Manusmriti
स्पृशन्ति बिन्दवः पादौ य आचामयतः परान् । भौमिकैस्ते समा ज्ञेया न तैराप्रयतो भवेत् ॥ १४२ ॥
Drops which trickle on the feet of him who offers water for sipping to others, must be considered as equal to (water collected on the ground; they render him not impure.
english translation
spRzanti bindavaH pAdau ya AcAmayataH parAn । bhaumikaiste samA jJeyA na tairAprayato bhavet ॥ 142 ॥
hk transliteration by Sanscript