מדרש על במדבר 2:32

These are the accountings of the children of Israel according to their fathers' house etc (Numbers 2:32). On ten occasions were Israel counted: Once when they went down to Egypt "all the persons of Yaakov’s household who came to Egypt: seventy" (Genesis 46:27). A second time when they came out" The Children of Israel moved on from Ra’amses to Sukkot, about six hundred thousand on foot, menfolk apart from little-ones" (Exodus 12:37). A third time after the incident of the Golden Calf: "when you take up the head-count of the Children of Israel, in counting them, they are to give, each-man, a ransom for his life, for Ad-nai, when they count them, that there be no plague on them, when they count them. (Exodus 30:12). Twice in the Book of Numbers [chumash hapekudim]: once in connection with the formation of the camps (Numbers 1:2) and once in connection with the division of the land (Numbers 26:2). Twice in the days of Shaul "[Shaul] mustered them in Bezek, and the Israelites numbered 300,000, the men of Yehudah 30,000" and "Shaul mustered the troops and enrolled them at Telaim: 200,000 men on foot, and 10,000 men of Yehudah" (1 Samuel 11:8, 15:4). The eighth time in the days of David "Yoav reported to the king the number of the people that had been recorded: in Israel there were 800,000 soldiers ready to draw the sword, and the men of Yehudah numbered 500,000" (2 Samuel 24:9). The ninth time in the days of Ezra "The sum of the entire community was 42,360" (Ezra 2:64; see also Nehemiah 7:66). The tenth time will be in the future era, when, "the sheep shall pass again under the hands of One who counts them [said Ad-nai]" (Jeremiah 33:13).