You should o king, know that man to be guilty of Brahmanicide who puts impediments in the way of thirsty kine while engaged in satisfying that thirst.
गोकुलस्य तृषार्तस्य जलार्थे वसुधाधिप। उत्पादयति यो विघ्नं तं विद्याद् ब्रह्मघातिनम्॥