Ka'b bin 'Ujra (RA) reported that the Apostle of Allah ( صلی اللہ علیہ وسلم ) happened to pass by him at Hudaibiya before entering Makkah in a state of Ihram and he (Ka'b) was kindling fire under the cooking pot and virmins were creeping on his (Kab's) face. Thereupon (the Holy Prophet) said: Do these vermins trouble you? He (Ka'b) said: Yes. The Messenger of Allah ( صلی اللہ علیہ وسلم ) said: Shave your head and give some quantity of food enough to feed six needy persons (faraq is equal to three sa's), or observe fast for three days or offer sacrifice of a sacrificial animal. Ibn Najih (one of the narrators) said: "Or sacrifice a goat."