Where does “порадоваться” come from?

порадоваться (Russian) comes from Russian -ся, from Old East Slavic сѧ, from Proto-Slavic sę, from Proto-Balto-Slavic *sen, from Proto-Indo-European swé — self.

порадоваться (Russian): to rejoice for awhile; passive of пора́довать

Definitions

to rejoice for awhile; passive of пора́довать

Ancestry of “порадоваться”, step by step

Step	Language	Word	Meaning
1	Russian	-ся	Reflexive suffix appended to finite verbs and...
2	Old East Slavic	сѧ	—
3	Proto-Slavic	sę	oneself: myself, yourself, himself, herself,...
4	Proto-Balto-Slavic	*sen	oneself
5	Proto-Indo-European	swé	self

Every word from Proto-Indo-European swé →Every word from Russian -ся →Every word from Proto-Balto-Slavic *sen →