Sahih al-Bukhari, Volume 8, Book 76, Hadith 497 (USC-MSA) ⓘ
Narrated Abu Huraira: Allah's Messenger said, "If anyone of you looked at a person who was made superior to him in property and (in good) appearance, then he should also look at the one who is inferior to him.
حَدَّثَنَا إِسْمَاعِيلُ، قَالَ حَدَّثَنِي مَالِكٌ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا نَظَرَ أَحَدُكُمْ إِلَى مَنْ فُضِّلَ عَلَيْهِ فِي الْمَالِ وَالْخَلْقِ، فَلْيَنْظُرْ إِلَى مَنْ هُوَ أَسْفَلَ مِنْهُ " .
also referenced under: Book 81, Hadith 79 (In-Book) & Hadith 6490 (DarusSalam)