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SB 10.57.21

padāter bhagavāṁs tasya
 padātis tigma-neminā
cakreṇa śira utkṛtya
 vāsasor vyacinon maṇim
Synonyms: 
padāteḥ — of him who was on foot; bhagavān — the Supreme Lord; tasya — his; padātiḥ — Himself on foot; tigma — sharp; neminā — whose edge; cakreṇa — with His disc; śiraḥ — head; utkṛtya — severing; vāsasoḥ — within Śatadhanvā’s garments (upper and lower); vyacinot — He searched for; maṇim — the jewel.
Translation: 
As Śatadhanvā fled on foot, the Supreme Lord, also going on foot, cut off his head with His sharp-edged disc. The Lord then searched Śatadhanvā’s upper and lower garments for the Syamantaka jewel.