‏النذر : Hadeeth No:4019 'Abdullah b. Umar reported: Allaah's Messenger (may peace he upon him) singled out one day forbidding us to take vows and said: It would not avert anything; it is by which something is extracted from the miserly person....

‏البر والصلة والآداب‏ : Hadeeth No:6211 This hadith has been transmitted on the authority of Zuhri with a slight variation of wording (and the words are):" The one turning away and the other turning away when they meet and one avoids the other and the other also avoids him."...