Shiva Purana
ब्रह्माणि भोजनान्ते तु यावन्मन्त्रांश्च साक्षतान् ॥ दत्त्वोत्तरापोशनं च हस्तांघ्रिमुखशोधनम् ॥ १८॥
At the end of the meal the Brahmans and the mantras were witnessed After giving them food they should cleanse their hands feet and face.
english translation
brahmANi bhojanAnte tu yAvanmantrAMzca sAkSatAn ॥ dattvottarApozanaM ca hastAMghrimukhazodhanam ॥ 18॥
hk transliteration by Sanscript