Chapter on the Etiquettes of the Fasting Person, What Invalidates the Fast, and What Does Not Invalidate it

A fasting person is also not allowed to apply medicine through the nostrils. However, there is no harm in pouring medicine into the ear, feeding a bird, or chewing bread for an infant without swallowing anything. There is no harm in smelling perfumes, except powdered ones, as they ascend to the brain. Similarly, there is no harm for a cook to taste broth with his tongue to determine its sweetness or sourness, as long as he does not swallow it.