From Sahih Bukhari (Hadith 2896):
Narrated Mus`ab bin Sa`d:Once Sa`d (bin Abi Waqqas) thought that he was superior to those who were below him in rank. On that the Prophet (ﷺ) said, "You gain no victory or livelihood except through (the blessings and invocations of) the poor amongst you
Reference: Bukhari 2896