Magic Initiate: Cleric is a Passive Feature provided by the Feat of the same name. It grants you spells and cantrips from that particular class.
Description
You learn 2 cantrips and a Level 1 spell from the Cleric spell list. You can cast the Level 1 spell once per Long Rest. Your Spellcasting Modifier for all 3 spells is 
Wisdom.
How to learn
Granted by feats: Magic Initiate: Cleric (Feat)