Comparing yourself to others.

السلام عليكم
بِسْمِ اللهِ الرَّحْمنِ الرَّحِيمِ

Look at those who are inferior to you and do not look at those who are superior to you, for this will keep you from belittling Allah's favors to you. [Al Bukhari & Muslim] This is the wording in Sahih Muslim.
In Al Bukhari it is narrated:
"When one of you looks at someone who is superior to him in property and appearance, he should look at someone who is inferior to him."