John Gill Commentary John 4:31

"In the mean while the disciples prayed him, saying, Rabbi, eat." — John 4:31 (ASV)

In the mean while
While the woman was gone into the city, and had acquainted the inhabitants, that such a wonderful person was at Jacob's well, and invited them to come and see him:

his disciples prayed him, saying, master, eat ;
for they perceived a disinclination in him to food; and they knew that he was weary with his journey, and that it was the time of day, and high time, that he had had some food; and therefore out of great respect to him, and in concern for his health and welfare, they entreated him that he would take some food: so far was Christ from indulging his sensual appetite; and so little reason had the Scribes and Pharisees to traduce him as a wine bibber and glutton.