A pious character can spend time between adventures performing sacred rites in a temple affiliated with a god he or she reveres. Between rites, the character spends time in meditation and prayer.
A character who is a priest in the temple can lead these rites, which might include weddings, funerals, and ordinations. A layperson can offer sacrifices in a temple or assist a priest with a rite.
A character who spends at least 10 days performing sacred rites gains inspiration (described in chapter 4 of the Player’s Handbook) at the start of each day for the next 2d6 days.