Fiqh-us-Sunnah Volume 5, Hajj and ‘Umrah, Fiqh 5.003B.
Section : The Excellence of Spending in Hajj.
Buraidah reports the Prophet (peace be upon him) as saying: “Spending during Hajj is akin to spending in the cause of Allah, and every dirham thus spent will be rewarded seven hundred times over.” (Reported by Ibn Abi Shaibah, Ahmad, At-Tabarani and Al-Baihaqi)