Astanga Hrudaya
नाभिः सोऽपि हि सद्योघ्नोद्वारमामाश्यस्य च। सत्वादिधाम हृदयम् स्तनोरः कोष्ठमध्यगम्॥१३॥
Even its injury causes death quickly. In between the chest and abdomen, between the two breasts and at the opening of the stomach is the hrdaya, which is the seat of satva (soul/life) etc. (Injury to it also causes quick death).
english translation
nAbhiH so'pi hi sadyoghnodvAramAmAzyasya ca। satvAdidhAma hRdayam stanoraH koSThamadhyagam॥13॥
hk transliteration by Sanscript