Charak Samhita
अश्विनौ देवभिषजौ यज्ञवाहाविति स्मृतौ। यज्ञस्य हि शिरश्छिन्नं पुनस्ताभ्यां समाहितम् ॥४१॥
Ashwins are the physicians of gods and carriers of sacrifices. The head of sacrifice was cut which was joined by Ashwins.
english translation
azvinau devabhiSajau yajJavAhAviti smRtau। yajJasya hi zirazchinnaM punastAbhyAM samAhitam ॥41॥
hk transliteration by Sanscript