The testimony provided by Nabal's shepherds highlights the exemplary behavior of David's men. Their actions went far beyond basic decency, creating a clear obligation to repay their kindness with gratitude and reward [מלבי״ם]. The primary approach among commentators is that David's men treated the shepherds exceptionally well, and this goodness is defined by a complete absence of harm.
Throughout their time together, the shepherds never experienced any shame, verbal abuse, or insult from David's camp [רש״י, מצודת דוד, מצודת ציון, מלבי״ם]. Similarly, they suffered absolutely no financial loss or missing property [מצודת ציון, מצודת דוד, ביאור שטיינזלץ, מלבי״ם].
This peaceful dynamic took place out in the open fields, a setting that adds significant weight to their restraint. A unique interpretation explains that this specifically refers to the times when the flocks had already been gathered into their pens after a day of grazing. During these hours, the shepherds were left alone in the fields without the immediate task of guarding the herds. It was precisely in these unguarded moments that David's men proved their deep reliability. They never took advantage of the situation to harm the shepherds, whether through harsh words or the theft of property [מלבי״ם].