The story basically goes like this, in the no-nonsense prose of the King James version;
1 And the Philistines took the ark of God, and brought it from Ebenezer unto Ashdod.
6 But the hand of the LORD was heavy upon them of Ashdod, and he destroyed them, and smote them with emerods, even Ashdod and the coasts thereof.
7 And when the men of Ashdod saw that it was so, they said, The ark of the God of Israel shall not abide with us: for his hand is sore upon us, and upon Dagon our god.
8 They sent therefore and gathered all the lords of the Philistines unto them, and said, What shall we do with the ark of the God of Israel? And they answered, Let the ark of the God of Israel be carried about unto Gath. And they carried the ark of the God of Israel about thither.
9 And it was so, that, after they had carried it about, the hand of the LORD was against the city with a very great destruction: and he smote the men of the city, both small and great, and they had emerods in their secret parts.
11 So they sent and gathered together all the lords of the Philistines, and said, Send away the ark of the God of Israel, and let it go again to his own place, that it slay us not, and our people: for there was a deadly destruction throughout all the city; the hand of God was very heavy there.
12 And the men that died not were smitten with the emerods: and the cry of the city went up to heaven.
1 And the ark of the LORD was in the country of the Philistines seven months.
2 And the Philistines called for the priests and the diviners, saying, What shall we do to the ark of the LORD? tell us wherewith we shall send it to his place.
3 And they said, If ye send away the ark of the God of Israel, send it not empty; but in any wise return him a trespass offering: then ye shall be healed, and it shall beknown to you why his hand is not removed from you.
4 Then said they, What shall be the trespass offering which we shall return to him? They answered, Five golden emerods, and five golden mice, according to the number of the lords of the Philistines: for one plague was on you all, and on your lords.
5 Wherefore ye shall make images of your emerods, and images of your mice that mar the land; and ye shall give glory unto the God of Israel: peradventure he will lighten his hand from off you, and from off your gods, and from off your land.
7 Now therefore make a new cart, ...
8 And take the ark of the LORD, and lay it upon the cart; and put the jewels of gold, which ye return him for a trespass offering, in a coffer by the side thereof; and send it away, that it may go.
11 And they laid the ark of the LORD upon the cart,and the coffer with the mice of gold and the images of their emerods.
14 And the cart came into the field of Joshua, a Bethshemite, and stood there, where there was a great stone: and they clave the wood of the cart, and offered the kine a burnt offering unto the LORD.
15 And the Levites took down the ark of the LORD, and the coffer that was with it, wherein the jewels of gold were, and put them on the great stone: and the men of Bethshemesh offered burnt offerings and sacrificed sacrifices the same day unto the LORD.
17 And these are the golden emerods which the Philistines returned for a trespass offering unto the LORD; for Ashdod one, for Gaza one, for Askelon one, for Gath one, for Ekron one;
18 And the golden mice, according to the number of all the cities of the Philistines belonging to the five lords, both of fenced cities, and of country villages, even unto the great stone of Abel, whereon they set down the ark of the LORD: which stone remaineth unto this day in the field of Joshua, the Bethshemite.
Emerods; hemorrhoids - Check the full Oxford English Dictionary. The Philistines stole the ark, God cursed them with hemorrhoids, and so they gave back the ark with an extra payoff of five golden hemorrhoids. A high-concept visual.
If you want to doublecheck the quote and you don't have a KJV handy, try here;
For a modern poetic interpretations, see 'Painful the Walk of the Men of Ashdod', by Richard P. Veraa.
Well, there you are; one of the undiscovered treasures of biblical archeology. One of these days some investigator's spade is going to turn up glory (if it hasn't already and it's being kept from us; the ark itself, after all, is in a government warehouse). In the meantime, can I ask you all to join my appeal to Stephen Spielberg to do the director's cut of Raiders of the Lost Ark, this time correcting the ending so that the curse inflicted on the Nazis is consonant with the known mode of operation of the ark?