A Priori all bachelors are unmarried is a priori, and A Posteriori it is raining outside

The terms “a priori” and “a posteriori” are used primarily to denote the foundations upon which a proposition is known. 

A given proposition is knowable a priori if it can be known independent of any experience other than the experience of learning the language in which the proposition is expressed, whereas a proposition that is knowable a posteriori is known on the basis of experience. 

For example, the proposition that all bachelors are unmarried is a priori, and the proposition that it is raining outside now is a posteriori.The distinction between the two terms is epistemological and immediately relates to the justification for why a given item of knowledge is held. For instance, a person who knows (a priori) that “All bachelors are unmarried” need not have experienced the unmarried status of all—or indeed any—bachelors to justify this proposition. 

By contrast, if I know that “It is raining outside,” knowledge of this proposition must be justified by appealing to someone’s experience of the weatherTake Pelosi and other Dem Politicians (Harris, Booker) A priori justification it is a questionof 'morals' is thereby allegedly accounted for in a metaphysically innocuous way.ie such people are intellectually harmlessWhile phenomenologically plausible it is 'moral' and epistemically illuminating (for believers)  a moral claim  for priori justification is an abstraction that is not plausible and is strewn with dificulties

 A priori justification (it is moral)  is a way  to avoid an appeal to rational insight.