Magic Weapon

Source: Player's Handbook
  2nd-level transmutation
  Casting Time: 1 bonus action Range: Touch Components: V, S Duration: Concentration, up to 1 hour
  You touch a nonmagical weapon. Until the spell ends, that weapon becomes a magic weapon with a +1 bonus to attack rolls and damage rolls.
  At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the bonus increases to +2. When you use a spell slot of 6th level or higher, the bonus increases to +3.
  Spell Lists. Artificer, Paladin, Ranger, Sorcerer, Wizard