Bless

Source: Player's Handbook

Level 1 Enchantment (Cleric, Paladin)

Casting Time: Action
Range: 30 feet
Components: V, S, M (a Holy Symbol worth 5+ GP)
Duration: Concentration, up to 1 minute

You bless up to three creatures within range. Whenever a target makes an attack roll or a saving throw before the spell ends, the target adds 1d4 to the attack roll or save.

Using a Higher-Level Spell Slot. You can target one additional creature for each spell slot level above 1.