Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) mentioned (the prayer) and said: "Whoever guards it, it will be a light and a proof for him; and whoever does not guard it will have neither light nor proof, and he will be with Pharaoh, Haman and Ubayy bin Khalaf."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13760