Final answer:
The teachers of religious law known as Pharisees saw Jesus and his disciples walking through the grainfields, which is a scene recorded in the Gospels.
Step-by-step explanation:
The individuals who saw Jesus and his disciples walking through the grainfields were some of the teachers of religious law, specifically the Pharisees. This event is depicted in various passages of the Gospels, where the Pharisees often question or challenge Jesus' actions and those of his disciples. In the context of the grainfields, the Pharisees' focus would likely have been on the adherence to the Sabbath laws, which included restrictions on activities such as harvesting grain. The narratives surrounding this event and the interactions with the Pharisees serve as a part of the larger story of Jesus' ministry and the challenges he faced from religious authorities of the time.