(16) باب الْيَمِينِ الْغَمُوسِ
Narrated `Abdullah bin `Amr:
The Prophet (ﷺ) said, "The biggest sins are: To join others in worship with Allah; to be undutiful to one's parents; to kill somebody unlawfully; and to take an oath Al-Ghamus.
Reference: Sahih al-Bukhari 6675
In-book reference: Book 83, Hadith 53
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 78, Hadith 667