Magic Weapon

Level: 2

Casting Time: 1 bonus action

Range: Touch

Duration: Concentration, up to 1 hourYou 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: PHB, page 257. Available in the SRD.