‏فضائل الصحابة‏ : Hadeeth No:6146 Jubair b. Mut'im reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: There is no alliance (hilf) in Islam but (the hilf) established in the pre-Islamic days (for good). Islam intensifies and strengthens it....

‏الصيام : Hadeeth No:2542 This hadith has been narrated on the authority of Ibrahim b. Tahman with the same chain of transmitters but with this variation that he said: Both of them made the announcement."...