John Gill Commentary Ruth 2:16

"And also pull out some for her from the bundles, and leave it, and let her glean, and rebuke her not." — Ruth 2:16 (ASV)

And let fall some of the handfuls on purpose for her
That is, when they had reaped a handful, instead of laying it in its proper order to be taken up by those who gathered after them, or by themselves, to be bound up in sheaves, they should scatter it about, or let it fall where they reaped it:

and leave them, that she may glean them, and do not rebuke her
for taking them, as if she did a wrong thing.