Aśauca-vidhi (Rules of Impurity) within Śrāddha-kalpa — Chapter on Testing/Selecting Brahmanas and Honoring the Atithi
पिपासिताय श्रान्ताय भ्रान्तायातिबुभुक्षते / तस्मै सत्कृत्य दातव्यं यज्ञम्य फलमिच्छता
pipāsitāya śrāntāya bhrāntāyātibubhukṣate / tasmai satkṛtya dātavyaṃ yajñamya phalamicchatā
To one who is thirsty, weary, bewildered, and exceedingly hungry, the seeker of yajña’s fruit should give a gift with due honor.