The severe running of the horses, their hooves strike the stones creating sparks of fires.

So, the producers of sparks are the horses, however, some interpreters said that it refers to men’s cunning, others said it refers to insolent tongues, and some others said that it is the camels when they walk and strike pebbles with their soles.

Hence, this oath is general for all the producers of sparks whether horses or camels or tongues, since sometimes tongues do that.