‏الأضاحي : Hadeeth No:4836 Jabir reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Sacrifice only a grown-up animal, unless it is difficult for you, in which case sacrifice a ram (of even less than a year, but more than six months' age)....

‏فضائل الصحابة‏ : Hadeeth No:6012 Jabir b. 'Abdullah reported: I was shown Paradise and I saw the wife of Abu Talha (i. e. Umm Sulaim) and I heard the noise of steps before me and, lo, it was that of Bilal....