Strong's 1519 (εἰς)

(abundant-)ly, against, among, as, at, (back-)ward, before, by, concerning, + continual, + far more exceeding, for (intent, purpose), fore, + forth, in (among, at, unto, -so much that, -to), to the intent that, + of one mind, + never, of, (up-)on, + perish, + set at one again, (so) that, therefore(-unto), throughout, til, to (be, the end, -ward), (here-)until(-to), …ward, (where-)fore, with

to or into (indicating the point reached or entered), of place, time, or (figuratively) purpose (result, etc.); also in adverbial phrases

a primary preposition;