From Sahih Muslim (Hadith 6239):
This hadith has been transmitted on the authority of Simak and the hadith transmitted on the authority of Shu'ba (the words are):When they intended to feed her (Sa'd'. s mother), they opened her mouth with the help of a stick and then put the feed in her mouth, and in the same hadith the words are: He struck the nose of Sa'd and it was injured and Sa'd had (the mark) of wound on his nose
Reference: Muslim 6239