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, "Allah's right hand is full" (and Ibn Numayr said, "is brimming"), "overflowing, nothing diminishes it, night and day."In another narration, the Messenger of Allah ﷺ said, "Allah said to me, 'Spend, and I will spend on you.'"The Messenger of Allah ﷺ also said, "Allah's right hand is full, overflowing, nothing diminishes it night or day. Have you considered all that He has spent since He created the heavens and the earth? It has not diminished what is in His right hand. His Throne is upon the water, and in His other hand is the seizing, He raises and He lowers."
Azami 467
Sahihعن 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: إن الله قال لي: أنفق أنفق عليك. وقال رسول الله ﷺ: يمين الله ملأى لا يغيضها سحاء الليل والنهار. أرأيتم ما أنفق من خلق السماء والأرض؟ فإنه لم يغض ما في يمينه. قال: وعرشه على الماء، وبيده الأخرى القبض يرفع ويخفض.
Muslim narrated it in the chapter on zakat (993) via Ibn Uyayna, from Abu Zinad, from Aaraj, from Abu Hurairah, and he related it accordingly. The second narration was also transmitted by Muslim via Abdul-Razzaq, who said, Muamar bin Rashid narrated to us, from Hammam bin Munabbih, who said, this is what Abu Hurairah narrated to us, and he related the hadith.Bukhari also narrated it through this same route in the chapter on tawhid (7419) with wording close to it. He also narrated it in the chapter on expenditures (5352) from Ismail, from Malik, from Abu Zinad, with his chain, and its wording is, "Allah said, spend, O son of Adam, and I will spend on you."This narration is not found in the printed copies of Muwatta.