It is narrated from Sayyiduna As'ad bin Zurarah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever would be pleased for Allah to shade him on the Day when there is no shade but His shade, let him make things easy for one in hardship or forgive him (his debt)."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 895