Magic Weapon

Artificer    Paladin    [Ranger]    [Sorcerer]    Wizard

Level 2 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.

Source: Player's Handbook, p. 257