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There are not rules for this because it is something that should never be done. AS a GM you can do anything you want, but there are somethings you should not do and this is one of them. Danger is part of the game and in sometimes that means that the characters die or even experience a TPK (Total Party Kill). By stepping in like this you cheapen the game and make the players less important.
Pathfinder specifically has not rules for what gods can do because they are beyond what the rules can define.
You may not mean this but your response comes across as condescending and pretentious. The OP didn't ask should but how, and to answer that question there is no set rules but it is implied. I.E. Gamemastery Guide pg 49-50 TPK, one of the options is meet your new boss " a mysterious presence intervenes and resurrects the party" or otherwise gets involved this sounds very much like a deity or something very close and in order to engage players and fit a overall story ark it would make more sense for a deity to intervene for a follower and allow that follower to assist the rest of the party as a champion. The other option that would fit this from the same section as I don't really want to go through other books listing the ways gods intervene for mortals cough (miracle) is the option to rewind which to me with out a story driven excuse I.E. Divine intervention, is game breaking since you literally as dm step in and completely redo an encounter. Also there are other books for 3E which are OGL that you could use as a guide for example https://forgottenrealms.fandom.com/wiki/Faiths_and_Pantheons if I remember correctly this book lists godly powers as if they were feats, and godly levels, and explains how the gods interact and while this is for dnd 3e it still works well as a guide.
In summary for the OP this is entirely up to you how you do this, as a new GM you'll figure out what works best for you and your group and what is the most for everyone involved. And as you GM more you will get more comfortable building encounters. Me personally I generally treat gods as only interfering on behalf of their followers not others. i.e. heal them or rez them only, not other creatures. Good luck with your game and I hope your enjoying your first foray into GMing.