Hadith- Lower than you

Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "Look at those who are lower than you and do not look at those who are higher than you. That is more likely to prevent you underestimating the blessing of Allah on you." [Agreed upon]

These are the words of Muslim. In one variant, "When one of you sees someone who has been given more bounty in respect of wealth or physical strength, he should then look at someone who has less than him."

Riyad as-Salihin (The Meadows of the Righteous) of Iman Mohieddine Annawawi 631-676.  Chapter 55: "The Excellence of making do with little of this world and the encouragement to have little of it and the excellence of poverty",  Hadith  467.