PHB
Shield of Faith
1-level Abjuration
Casting Time: 1 bonus action
Range/Area: 60 feet
Components: V, S, M
Materials: a small parchment with a bit of holy text written on it
Duration: Concentration, 10 minutes
A shimmering field appears and surrounds a creature of your choice within range, granting it a +2 bonus to AC for the duration.