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The Christian Arabs, however, locked themselves in four citadels and refused to surrender. These citadels were the white palace commanded by Iyaz bin Qubeis; the Al Adassiyeen palace commanded by Adi bin 'Adi; the Bani Mazin palace commanded by Ibn Akal; and Ibn Bugela palace commanded by Abdul Maseeh. The Muslims pressed the siege of the four citadels, and it was not long before the Christian Arabs were forced to ask for terms. The Christian Arabs surrendered, and agreed to pay an annual tribute to the Muslims.
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari