2,646. Specifying Things Separately
Hilchos Shevuos 4:6
If someone takes an oath not to eat and not to drink and he then eats and drinks, he is liable twice even though drinking is included in eating. This is because he specifically stated that he wouldn’t drink, from which we see that he didn’t intend to include drinking in eating. It is therefore as if he took a separate oath about each activity, with the result that he’s liable twice.
Hilchos Shevuos 4:7
Similarly, if a person took an oath not to eat wheat bread, barley bread or spelt bread, he is distinctly liable for eating each one. Since he specified bread three times, he differentiates among them, with the result that he’s liable separately for each one.