Thieving Blade (5e Equipment)
From D&D Wiki
When you hit a creature with this magic weapon, you can make a DC 10 Dexterity (Sleight of Hand) check to steal one item from the target. The item cannot be currently held or strongly tethered, and must weigh 2 lbs or less. Examples include a loose item in a pocket, a belt pouch, or a pendant worn on thin chain. The item is hooked on the end of the weapon. The item can then be transferred to your free hand or your pocket as a bonus action. It is otherwise dropped to the floor if you make another attack with the weapon.