‏البيوع : Hadeeth No:3882 Nu'man b. Bashir (Allaah be pleased with him) reported: I heard Allaah's Messenger (sallAllaahu alayhi wa sallamn) as having said this (and Nu'man) pointed towards his ears with his fingers): What is lawful is evident and what is unlawful is evident, and in between them are the things doubtful which...

‏الزهد والرقائق‏ : Hadeeth No:7131 The son of Abu Said al-Khudri reported on the authority of his father that Allaah's Messenger (sallAllaahu alayhi wa sallam) said: When one of you yawns, he should try to restrain it with cue help of his hand since it is the Satan that enters therein....