Willful talking during Salah

Q 7: How to prove that willful talking during Salah (Prayer) invalidates it?

A: The Prophet (peace be upon him) said: "Irrelevant talk is not fitting during this Salah of ours." However, the Salah offered by a person, who speaks unintentionally, or is ignorant of the ruling is valid, and they are excused.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.