Chapter on the Greater and Lesser Pilgrimages
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 3|Chapter 135
رُوِيَ عَنْ مُعَاوِيَةَ بْنِ عَمَّارٍ قَالَ: سَأَلْتُ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ عَنْ يَوْمَ اَلْحَجِّ اَلْأَكْبَرِ فَقَالَ «هُوَ يَوْمُ اَلنَّحْرِ وَ اَلْأَصْغَرُ هُوَ اَلْعُمْرَةُ ».
It is narrated from Mu'awiya ibn Ammar who said: "I asked Abu Abdullah عليه السلام about the Day of the Greater Pilgrimage (Yawm al-Hajj al-Akbar). He said, 'It is the Day of Sacrifice (Yawm al-Nahr), and the Lesser Pilgrimage (al-Asghar) is the Umrah.'"
- Ṣaḥīḥ al-Faqīh, p. 173