‏الزهد والرقائق‏ : Hadeeth No:7130 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 keep his mouth shut with the help of his hand, for it is the devil that enters therein....

‏القدر : Hadeeth No:6394 This hadith has been narrated on the authority of 'Abdullah b. Mas'ud through another chain of transmitters....