‏النكاح : Hadeeth No:3292 Abu Huraira (Allaah be pleased with him) reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: The Muslim should not purchase in opposition to his brother, and he should not make the proposal of marriage on the proposal already made by his brother....

‏الزكاة : Hadeeth No:2173 Abu Huraira reported the same from the Prophet (sallAllaahu alayhi wa sallam)....