Sūta Gosvāmī said: Just then Arjuna could understand the motive of the Lord by His equivocal orders, and thus with his sword he severed both hair and jewel from the head of Aśvatthāmā.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
सूत उवाच । अर्जुनः सहसाऽऽज्ञाय हरेर्हार्दमथासिना । मणिं जहार मूर्धन्यं द्विजस्य सहमूर्धजम्
sūta uvāca | arjunaḥ sahasā''jñāya harerhārdamathāsinā | maṇiṃ jahāra mūrdhanyaṃ dvijasya sahamūrdhajam
SB 1.7.55