Pious Soul( Complete Divine, p. 86)
By adhering to the precepts of your religion or philosophy, you gain an extra edge when you need it most.
Knowledge (religion) 2 ranks,
You can spend a faith point to add 1d6 to your d20 roll on an attack, save, or check--even after you've seen the d20 roll, as long as the DM hasn't announced whether you've succeeded or failed. You can choose to spend more than one faith point at a time in this way.
When chosen, this feat gives you 4 faith points, and you may earn additional faith points as outlined in the Faith Feats section.