John Gill Commentary 1 Samuel 19:22

"Then went he also to Ramah, and came to the great well that is in Secu: and he asked and said, Where are Samuel and David? And one said, Behold, they are at Naioth in Ramah." — 1 Samuel 19:22 (ASV)

Then went he also to Ramah
That is, Saul; his messengers not returning to him, when he sent one after another to take David, at length he set out himself from Gibeah to Ramah:

and came to a great well that [is] in Sechu ;
which was either the name of a man, the owner of the well, or a place near to which the well was, and is commonly thought to be the same with Shochoh, (1 Samuel 17:1) ; at such places there was generally a concourse of people at certain times, to fetch water for the inhabitants of the place, and for the watering of flocks and herds, and so a proper place to stop at, and ask the following questions:

and he asked and said, where [are] Samuel and David ?
for his messengers not returning to him, he could not be sure where they now were, though he had heard they were at Naioth:

and [one] said, behold, [they be] at Naioth in Ramah ;
at the house of doctrine, or school in Ramah, as the Targum; thus one at the well replied, in answer to his question, who had seen them go there, or knew they were there.