Hadith 510510
Chapter 24: Slaughtering Animals - كتاب الذبائح
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّهُ كَانَ يَقُولُ مَا ذُبِحَ بِهِ إِذَا بَضَعَ فَلاَ بَأْسَ بِهِ إِذَا اضْطُرِرْتَ إِلَيْهِ .
Yahya related to me from Malik from Yahya ibn Said that Said ibn al-Musayyab said, "There is no harm in whatever you slaughter with a cutting edge, as long as you are forced to do it by necessity."
Reference Muwatta Malik 510510
USC-MSA web (English) reference : Book 24, Hadith 6