Śrī Sūta Gosvāmī said: Draupadī then saw Aśvatthāmā, who was bound with ropes like an animal and silent for having enacted the most inglorious murder. Due to her female nature, and due to her being naturally good and well-behaved, she showed him due respects as a brāhmaṇa.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तथाऽऽहृतं पशुवत्पाशबद्धमवाङ्मुखं कर्मजुगुप्सितेन । निरीक्ष्य कृष्णापकृतं गुरोः सुतं वामस्वभावा कृपया ननाम च
tathā''hṛtaṃ paśuvatpāśabaddhamavāṅmukhaṃ karmajugupsitena | nirīkṣya kṛṣṇāpakṛtaṃ guroḥ sutaṃ vāmasvabhāvā kṛpayā nanāma ca
SB 1.7.42