Abu Hurairah (May Allah be pleased with him) reported:
Messenger of Allah ﷺ said, "If a believer had full knowledge of the chastisement of Allah, none would covet His Jannah; and were an infidel to know the Mercy Allah has, none would despair of His Jannah".

[Muslim].

وعن أبي هريرة، رضي الله عنه ، أن رسول الله ﷺ قال" لو يعلم المؤمن ما عند الله من العقوبة، ما طمع بجنته أحد، ولو يعلم الكافر ما عند الله من الرحمة، ما قنط من جنته أحد” ((رواه مسلم)).