Aagneyashastra

Once, Arjuna fought the gandharva Angaraparna on the banks of the Ganga, at night. He then mentioned the importance of this astra. He said that it had been given to Bhardwaja by Brihaspati, and itw as given to Arjuna by Drona as per Mahabharata Adiparva Chapter 170 verses 29-30.