Expelliarmus

You attempt to disarm an opponent without harming them. When cast, the creature targeted  must succeed a strength saving throw or the targeted object will fly 10 feet in a horizontal direction behind the creature. The targeted object can weigh up to 4 pounds. 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the maximum weight of objects that you can target with this spell increases by 1 pound.