You can find your answer in the Microchip midrange manual ...
DS31002A-page 2-11

and also probably in the relevant Pic datasheets ... oscillator section.

also add interesting readings ...

• AN826, “Crystal Oscillator Basics and Crystal Selection for rfPIC® and PIC® Devices” (DS00826)

• AN849, “Basic PIC® Oscillator Design”(DS00849)

• AN943, “Practical PIC® Oscillator Analysis and Design” (DS00943)

• AN949, “Making Your Oscillator Work” (DS00949)

Alain