During the caliphate of Umar, Amir Muawiyah was the ruler of Damascus. Yazid a brother of Muawiyah was the ruler of Jordan. When Yazid fled, Umar placed Jordan also under the charge of Muawiyah
During the caliphate of Uthman when Alqama Kinani the ruler of Palestine died, Palestine was also entrusted to the charge of Muawiyah. A little later when 'Amir b Sa'ad Ansari the ruler of Emessa resigned because of ill health, Uthman added Emessa as well to the charge of Amir Muawiyah Under Muawiyah, Syria thus came to be consolidated into a single Province.
"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