Does saying: "I will donate such-and-such" or "I will pray such-and-such" constitute a vow?

A vow (nadhr (definition)) is a commitment by a legally competent Muslim to perform an act of worship. It requires verbal articulation for those capable, or an equivalent for those unable to do so. There is no specific wording for it; rather, it is valid with any utterance that signifies commitment. The aforementioned wording is not considered a vow due to its lack of conveying commitment. A Muslim should not say with his tongue what he does not intend to fulfill.