It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Ask Allah Almighty with your hands spread out with the palms up, and do not ask with the backs of the hands upwards. When you have finished supplicating, wipe your faces with your hands."
Imam Abu Dawud (may Allah have mercy on him) said: This hadith is reported from Muhammad bin Ka'b al-Qurazi through various routes, and all of them are weak. This chain is the best of them, but it too is weak.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3151