Mahabharata 12.281.6

अपो हि प्रयतः शीतास्तापिता ज्वलनेन वाशक्तितोऽतिथये दत्त्वा क्षुधार्तायाश्नुते फलम्

apo hi prayataḥ śītāstāpitā jvalanena vāśaktito'tithaye dattvā kṣudhārtāyāśnute phalam

Our plain-language meaning of this verse is waiting for scholar review.