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Second, the defeat of the Persians paved the way for major Arab migrations to Iraq and more fertile regions of the Middle East. Although Arabs were present before in many towns and cities in the Middle East, this now meant the Arabic language started becoming more prominent as migrants came to different regions. With the use of Arabic in Islam, it cemented the spread of this new common language to be widespread across not only the Middle East but it soon spread to Iran and west to North Africa.<ref>For more on the migrations that followed the conquest of Iraq, see: Sharqāwī, Muḥammad. 2010. <i>The Ecology of Arabic: A Study of Arabicization.</i> Leiden; Boston: Brill, pg. 166.</ref>

Third, the battle gave the Islamic armies a lot of confidence and experience. This led to much more rapid gains in the Middle East and North Africa against the Byzantines. While the Arabs never defeated the Byzantines, they solidified their hold on the Middle East. Between 646 and 732, the Arab armies had almost been unstoppable in open battlefields, although sieges of great cities, such as Constantinople, gave them more difficulty (Figure 2).<ref>For more on Arab and Islamic conquests and defeats after Qadisiyyah, see: Hoyland, Robert G. 2015. <i>In God’s Path: The Arab Conquests and the Creation of an Islamic Empire.</i> Ancient Warfare and Civilization. Oxford ; New York: Oxford University Press.</ref> The Arab was only stalled by Charles Martel's victory in 732.