‏النكاح : Hadeeth No:3409 Ibn Abbas (Allaah be pleased with them) reported: It was proposed that he (the Prophet) be married to the daughter of Hamza, whereupon he said: She is not lawful for me for she is the daughter of my foster-brother, and that is unlawful by reason of fosterage what is unlawful by reason of genealogy....

‏الصلاة : Hadeeth No:966 This hadith with the same chain of transmitters has been narrated by Shu'ba, and in the narration of Mu'adh the words are:" just as the white garment is cleansed from filth," and in the narration of Yazid:" from dirt"....