Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: During the campaign of Ta'if, a piece of cheese was brought to the Prophet (peace and blessings be upon him), and his Companions began poking at it with their sticks, saying: We fear that there may be (something of) carrion in it. So the Messenger of Allah (peace and blessings be upon him) said: "Put the knife into it and mention the name of Allah over it."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11757