'Forty' in the Bible

About forty thousand armed for military service passed over before Jehovah to the war, unto the plains of Jericho.

For the children of Israel had walked forty years in the wilderness, till the whole nation of men of war had perished who had come out of Egypt, who had not hearkened to the voice of Jehovah; to whom Jehovah had sworn that he would not show them the land which Jehovah had sworn unto their fathers that he would give us, a land flowing with milk and honey.

Forty years old was I when Moses the servant of Jehovah sent me from Kadesh-barnea to search out the land; and I brought him word again as it was in my heart.