Is the following Hadith mentioned: "Whoever strives to fulfill people's needs will sit at the Right Hand of the Most Merciful (Ar-Rahman)"?

We have not come across any evidence that the fulfilling of needs (qada’ al-hawaij) is on the right hand of the All-Merciful. Ibn Abi al-Dunya did not mention it in his comprehensive book. Perhaps the questioner is referring to the Hadith in Sahih Muslim: "Indeed, the just ones (al-muqsitoon) will be on pulpits of light to the right of the Most Merciful, Glorified and Exalted be He—and both of His hands are Right—those who are just in their rulings, their families, and whatever they are entrusted with." And al-muqsit is the just one.