Aid

D&D 2014 spell: Aid. Source: Player's Handbook (2014). level 2, school Abjuration, casting time 1 action, range 30 feet, duration 8 hours

Your spell bolsters your allies with toughness and resolve. Choose up to three creatures within range. Each target's hit point maximum and current hit points increase by 5 for the duration.

At Higher Levels

At Higher Levels When you cast this spell using a spell slot of 3rd level or higher, a target's hit points increase by an additional 5 for each slot level above 2nd.

Source: Player's Handbook (2014), p. 211 - Licenses and attribution