‏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....

‏فضائل الصحابة‏ : Hadeeth No:5898 Abu Huraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Wtiile'l was asleep I saw myself in Paradise and a woman performing ablution by the side of a palace. I said: For whom is it meant? They said: It is meant for 'Umar b. Khattab. (The Prophet) said: There came across my ...