Salman (RAA) narrated that the Messenger of Allah (ﷺ) said:
"Your Rabb (Lord of the Universe) is Modest and Generous, and would never turn the hands of a slave without gain when he raises them to Him (in supplication)." Related by the four lmams except An-Nasa'i. Al-Hakim graded it as Sahih.
English reference: Book 16, Hadith 1595
Arabic reference: Book 16, Hadith 1552