John Gill Commentary 1 Samuel 20:35

"And it came to pass in the morning, that Jonathan went out into the field at the time appointed with David, and a little lad with him." — 1 Samuel 20:35 (ASV)

And it came to pass in the morning:
The next morning, the morning of the third day of the month:

that Jonathan went out into the field at the time appointed with David ;
he went to the place in the field, or near it, where David hid himself, and at the time agreed between them; which, Abarbinel says, was the time the nobles agreed on for walking, and motion, and for hunting, and casting of arrows, so that Jonathan could go forth without suspicion:

and a little lad with him ;
to carry his bow and arrows, and fetch his arrows when cast.