The big 4-0

Genesis 7:4 For yet seven days, and I will cause it to rain upon the earth forty days and forty nights; and every living substance that I have made will I destroy from off the face of the earth.

Genesis 7:12 And the rain was upon the earth forty days and forty nights. 

Genesis 7:17 And the flood was forty days upon the earth; and the waters increased, and bare up the ark, and it was lift up above the earth. 

Genesis 8:6 And it came to pass at the end of forty days, that Noah opened the window of the ark which he had made: 

Genesis 25:20 And Isaac was forty years old when he took Rebekah to wife, the daughter of Bethuel the Syrian of Padanaram, the sister to Laban the Syrian. 

Genesis 26:34 And Esau was forty years old when he took to wife Judith the daughter of Beeri the Hittite, and Bashemath the daughter of Elon the Hittite: l

Exodus 16:35 And the children of Israel did eat manna forty years, until they came to a land inhabited; they did eat manna, until they came unto the borders of the land of Canaan. 

Exodus 24:18 And Moses went into the midst of the cloud, and gat him up into the mount: and Moses was in the mount forty days and forty nights. 

Exodus 26:19 And thou shalt make forty sockets of silver under the twenty boards; two sockets under one board for his two tenons, and two sockets under another board for his two tenons. 

Exodus 26:20-21 And for the second side of the tabernacle on the north side there shall be twenty boards: And their forty sockets of silver; two sockets under one board, and two sockets under another board. 

Exodus 34:28 And he was there with the Lord forty days and forty nights; he did neither eat bread, nor drink water. And he wrote upon the tables the words of the covenant, the ten commandments. 

Numbers 13:25 And they returned from searching of the land after forty days. 

Numbers 14:33 And your children shall wander in the wilderness forty years, and bear your whoredoms, until your carcases be wasted in the wilderness. 

Numbers 14:34-35 After the number of the days in which ye searched the land, even forty days, each day for a year, shall ye bear your iniquities, even forty years, and ye shall know my breach of promise. I the Lord have said, I will surely do it unto all this evil congregation, that are gathered together against me: in this wilderness they shall be consumed, and there they shall die. 

Numbers 32:13 And the Lord'S anger was kindled against Israel, and he made them wander in the wilderness forty years, until all the generation, that had done evil in the sight of the Lord, was consumed. 

Deuteronomy 2:7 For the Lord thy God hath blessed thee in all the works of thy hand: he knoweth thy walking through this great wilderness: these forty years the Lord thy God hath been with thee; thou hast lacked nothing. 

Deuteronomy 8:2 And thou shalt remember all the way which the Lord thy God led thee these forty years in the wilderness, to humble thee, and to prove thee, to know what was in thine heart, whether thou wouldest keep his commandments, or no. 

***** Deuteronomy 8:1-2 All the commandments which I command thee this day shall ye observe to do, that ye may live, and multiply, and go in and possess the land which the Lord sware unto your fathers. And thou shalt remember all the way which the Lord thy God led thee these forty years in the wilderness, to humble thee, and to prove thee, to know what was in thine heart, whether thou wouldest keep his commandments, or no.

Deuteronomy 9:9 When I was gone up into the mount to receive the tables of stone, even the tables of the covenant which the Lord made with you, then I
 abode in the mount forty days and forty nights, I neither did eat bread nor drink water:

Deuteronomy 9:11 And it came to pass at the end of forty days and forty nights, that the Lord gave me the two tables of stone, even the tables of the covenant.

Joshua 5:6 For the children of Israel walked forty years in the wilderness, till all the people that were men of war, which came out of Egypt, were consumed, because they obeyed not the voice of the Lord: unto whom the Lord sware that he would not shew them the land, which the Lord sware unto their fathers that he would give us, a land that floweth with milk and honey.

1 Samuel 17:16 And the Philistine drew near morning and evening, and presented himself forty days.

2 Samuel 5:4

David was thirty years old when he began to reign, and he reigned forty years.

Judges 5:31

So let all thine enemies perish, O Lord: but let them that love him be as the sun when he goeth forth in his might. And the land had rest forty years.

1 Kings 11:42

And the time that Solomon reigned in Jerusalem over all Israel was forty years.