SB 6.8.38

imāṁ vidyāṁ purā kaścit
 kauśiko dhārayan dvijaḥ
yoga-dhāraṇayā svāṅgaṁ
 jahau sa maru-dhanvani
Word for word: 
imām — this; vidyām — prayer; purā — formerly; kaścit — someone; kauśikaḥ — Kauśika; dhārayan — using; dvijaḥ — a brāhmaṇa; yoga-dhāraṇayā — by mystic power; sva-aṅgam — his own body; jahau — gave up; saḥ — he; maru-dhanvani — in the desert.
Translation: 
O King of heaven, a brāhmaṇa named Kauśika formerly used this armor when he purposely gave up his body in the desert by mystic power.