Yahya related to me from Malik from Yahya ibn Said that Said ibnal-Musayyab said, "There is no harm in whatever you slaughter with acutting edge, as long as you are forced to do it by necessity." (JA)
USC-MSA web (English) reference: Book 24, Hadith 6 (JA)
Arabic reference (JA): Book 24, Hadith 1051 (JA)