This excerpt is taken from Sheikh Abu Hamza Abdul Khaliq Siddiqi's book Sahi Fazail-e-Amaal.
It is narrated from Sayyida Aisha (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said to her regarding Umrah: "You will receive reward according to your fatigue and expenditure."
Reference: Mustadrak Hakim: 471/1
Hakim declared it "authentic according to the conditions of Bukhari and Muslim." And Dhahabi agreed with Hakim.