Salman reported God’s messenger as saying, “Your Lord is munificent and generous, and is ashamed to turn away empty the hands of a servant when he raises them to Him .”
Tirmidhi, Abu Dawud and Baihaqi, in ad-Da'awat al-kabir, transmitted it.
Malik b. Yasar reported God’s messenger as saying, “When you make requests of God, do so with the palms of your hands and not the backs upward.” In the version of Ibn ‘Abbas he said, “When you make requests of God, do so with the palms of your hands and not the backs upward, and when you are finished wipe your faces with them.”