First.....You need to slope the dirt away from the Slab foundation........and divert any gutters away from the building.......
Then address the sill/slab joint.....you need to attack it from the outside......remove or loosen the lower siding (?)....... and waterproof the joint......
That might involve a butyl caulk.......flashing ....or even a waterproof membrane..........
The sill may also be loose on the slab requiring additional fasteners.......
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