It is narrated on the authority of Abdullah ibn Umar (Radiyallahu Anhu)
that Rasulullah (Sallallahu Alaihi Wasallam) said; “There is no swallow more virtuous in the eyes of Allah than a person swallowing his anger for the pleasure of Allah”
(Musnad Ahmed, Hadith #: 128)
Lesson: The person who supresses his anger and maintains his calm solely for the pleasure of Allah is highly rewarded and earns the pleasure of Allah.