(4) باب تَحْرِيمِ الْغَدْرِ
It is narrated on the authority of Abu Sa'id that the Messenger of Allah (ﷺ) said:
On the Day of Judgment there will be a flag for every person guilty of the breach of faith. It will be raised in proportion to the extent of his guilt; and there is no guilt of treachery more serious than the one committed by the ruler of men.
Reference: Sahih Muslim 1738 b
In-book reference: Book 32, Hadith 19
USC-MSA web (English) reference(deprecated numbering scheme): Book 19, Hadith 4310