Abu Hurairah reported,

The narrator traced this back to the Prophet ﷺ, who said, "Allah said, 'Son of Adam, spend, and I will spend on you.'"He also said, "The right hand of Allah is full" (Ibn Numayr's wording was "filled to the brim"), "overflowing, never diminished by anything, night and day."In another narration, the Messenger of Allah ﷺ said, "I saw Allah, and He said to me, 'Spend, and I will spend on you.'"The Messenger of Allah ﷺ said, "The right hand of Allah is full, overflowing, never diminished by night or day. Have you considered all that He has spent since He created the heavens and the earth? It has not decreased what is in His right hand. His Throne is upon the water, and in His other hand is the grasp, raising and lowering."

عن أبي هريرة

يبلغ به النبي ﷺ قال: قال الله تبارك وتعالى: يا ابن آدم، أنفق أنفق عليك. وقال: يمين الله ملأى (وقال ابن نمير: ملآن) سحاء لا يغيضها شيء، الليل والنهار. وفي رواية قال رسول الله ﷺ: رأيت الله قال لي: أنفق أنفق عليك. وقال رسول الله ﷺ: يمين الله ملأى، لا يغيضها سحاء الليل والنهار. أرأيتم ما أنفق مذ خلق السماء والأرض؟ فإنه لم ينقص ما في يمينه. قال: وعرشه على الماء، وبيده الأخرى القبض، يرفع ويخفض.