الكافي 2/1/83/9

9. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa from ibn Mahbub from Ibrahim al-Khariqi who has said the following: “I heard Abu ‘Abdillah عليه السلام saying, ‘Whoever walks to help make the wish of his believing brother (in belief) come true, seeking thereby the reward for it with Allah until he makes it happen, Allah, the Most Majestic, the Most Holy, writes down for him a reward equal to the reward for performing Hajj and ‘Umrah that are of virtuous deeds, fasting for two of the sacred months while spending this time in the Sacred Mosque performing ‘I’tikaf (a certain form of worship), and if one walks with the intention to help, but does not make it come true, Allah still writes down for him the reward for one Hajj that is accepted. Therefore, be interested in good deeds.’”