John Gill Commentary 1 Samuel 13:20

"but all the Israelites went down to the Philistines, to sharpen every man his share, and his coulter, and his axe, and his mattock;" — 1 Samuel 13:20 (ASV)

But all the Israelites went down to the Philistines
Were obliged to go into Palestine, into some one or other of the cities of the Philistines, or to their garrisons, where the trade of a smith was exercised:

to sharpen every man his share, and his coulter ;
which are the parts of the plough made of iron, with which the earth is cut and thrown up:

and his axe and his mattock ;
or pick axe; with the one wood is felled and cut, and with the other stones are dug; and each of these for their several uses needed sharpening; and when they did, they were obliged to go to the Philistines to have them done, they having no smiths among them.