Where does “-ati” come from?

-ati (Old Czech) comes from Proto-Slavic -ati, from Proto-Slavic -ěti, from Proto-Balto-Slavic -ēˀtei, from Proto-Indo-European -éh₁ti — Creates stative verbs from perfective roots;...

Ancestry of “-ati”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	-ati	From imperfective verbs, forming...
2	Proto-Slavic	-ěti	Inherited, stative; Deadjectival, inchoative;...
3	Proto-Balto-Slavic	-ēˀtei	—
4	Proto-Indo-European	-éh₁ti	Creates stative verbs from perfective roots;...

Words derived from “-ati”

-at
havati
lísati
objímati
pobiehati
vztáhati
zacípati
objímat
hafat

Every word from Proto-Indo-European -éh₁ti →Every word from Proto-Slavic -ěti →Every word from Proto-Slavic -ati →