كتاب المناسك
Read the English translation first, with the original Arabic directly underneath.
It was narrated from Talhah bin ‘Ubaidullah that he heard the Messenger of Allah (ﷺ) say:
“Hajj is Jihad and ‘Umrah is voluntary.”
الْحَجُّ جِهَادٌ وَالْعُمْرَةُ تَطَوُّعٌ