‏النذر : Hadeeth No:4023 Abu Heraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Do not take vows, for a vow has no effect against Fate; it is only from the miserly that something is extracted....

‏الجهاد والسير‏ : Hadeeth No:4343 It has been narrated on the authority of Auf b. Malik al-Ashja'i who said: I joined the expedition that marched under Zaid b. Haritha to Muta, and I received reinformcement from the Yemen. (After this introduction), the narrator narrated the tradition that had gone before except that in his version ...