Verse 7

अथ शुश्राव कस्मिंश्चित्तमालवनगुल्मके ।सिद्धानामप्रदृश्यानां स्वप्रसङ्गादुदाहृताः

In plain words

Then, in a certain thicket of tamāla trees, he heard words spoken forth by Siddhas who could not be seen, uttered in the course of their own discourse --