He was seated on a straw mattress and speaking to all present, including the great sage Nārada, to whom he specifically spoke about the Absolute Truth.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
उपविष्टं दर्भमय्यां बृस्यां ब्रह्म सनातनम् । नारदाय प्रवोचन्तं पृच्छते शृण्वतां सताम्
upaviṣṭaṃ darbhamayyāṃ bṛsyāṃ brahma sanātanam | nāradāya pravocantaṃ pṛcchate śṛṇvatāṃ satām
SB 4.6.37