Shem was one of the three sons of Noah. Before the great flood that God used to judge the inhabitants of the earth for their great wickedness (Genesis 6:5–7), God instructed the righteous Noah to build a great ark to save Noah and his wife, along with their sons, Shem, Ham, and Japheth, and their wives. The Lord brought two of every kind of unclean animal and seven of every kind of clean animal and shut them up in the ark before the flood waters covered the earth (Genesis 7:14–16). The families and animals were in the ark for about 370 days: 40 days and 40 nights during the rains, and then the remainder of the time waiting for the flood waters to recede (see Genesis 7:1–8:19).