Hebrews 11:12 Therefore from one man, and him as good as dead, were born as many as the stars of the sky in multitude—innumerable as the sand which is by the seashore.
From the humble beginnings of Isaac, Abraham’s progeny were as numerous as three million during the Exodus and the wilderness wanderings. We do know that the men 20 years old or older that were conscripted into military service numbered 603,550, Numbers 1:46, 2:32. This number did not include the Levites (Numbers 2:33), nor women and children. The number of Israelites in this time was anticipated to be around three million by conservative estimate.