‏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)....

‏النكاح : Hadeeth No:3346 Jabir (Allaah be pleased with him) reported that Allaah's Messenger (may peace he upon him) said: When any one of you is invited to a feast, he should accept it. He may eat if he likes, or he may abandon (eating) if he likes. Ibn Mathanni did not make mention of the word" feast"....