There should be no delay in his capture
Narada and Ravana set out to capture Bali. Narada tells Ravana there is no need to take his famous sword against a mere monkey. Ravana then says this sword, the Chandrahasam, was given to him by none other than Lord Siva. With a little prompting by Narada, Ravana proceeds to describe how he came to receive the sword from Siva. These episodes are called Kailasoddharanam and Parvathiviraham.