Hadith.2242 - Imam Jafar ibn Muhammad Al-Sadiq (as) said: "If you included a thousand people in your Hajj, each one of them would receive the reward of a complete Hajj without anything being diminished from your own Hajj."
Al-Kāfi #1113“Abu al-Hassan (a.s.), has said that abu ‘ Abd Allah (a.s.), has said, ’Even if you share your al-Hajj with a thousand people, still there...