SB 9.21.10
paniya-matram ucchesam
tac caika-paritarpanam
pasyatah pulkaso ’bhyagad
apo dehy asubhaya me
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Thereafter, only the drinking water remained, and there was only enough to satisfy one person, but when the King was just about to drink it, a candala appeared and said, “O King, although I am lowborn, kindly give me some drinking water.”