Not true. At least not for the Muslim conquest of the Levant according to Ben Gurion, Israel’s first prime minister:

“The fellahin are not descendants of the Arab conquerors, who captured Eretz Israel and Syria in the seventh century CE. The Arab victors did not destroy the agricultural population they found in the country. They expelled only the alien Byzantine rulers, and did not touch the local population. Nor did the Arabs go in for settlement. Even in their former habitations the Arabs did not engage in farming…their whole interest in the new countries was political, religious and material: to rule, to propagate Islam, and to collect taxes…the Jewish farmer, like any other farmer, was not easily torn from his soil…Despite the repression and suffering the rural population remained unchanged.” [7]

Ben Gurion is quoted by Shlomo Sand in his book https://blogs.umb.edu/joinercenter/2012/10/09/review-of-shlomo-sand-the-invention-of-the-jewish-people-london-verso-2009-translated-by-yael-lotan/