مختصر صحيح بخاري
Mukhtasar Sahih Bukhari
Book of Zakat
Charity should be given only from surplus wealth
Narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings of Allah be upon him) said, and at that time he (peace be upon him) was on the pulpit and he (peace be upon him) was mentioning charity and avoiding asking: "The upper hand is better than the lower hand. The upper hand is the one that gives, and the lower hand is the one that asks."