G1524–εἴσειμι–eiseimi

Seeing Peter and John about to go into the temple, he asked to receive gifts for the needy.

εἰσιέναι eisienai “to enter”

The day following, Paul went in with us to James; and all the elders were present.

εἰσῄει eisēei “was going in”

Then Paul took the men, and the next day, purified himself and went with them into the temple, declaring the fulfillment of the days of purification, until the offering was offered for every one of them.

εἰσῄει eisēei “was entering”

Now these things having been thus prepared, the priests go in continually into the first tabernacle, accomplishing the services,

εἰσίασιν eisiasin “enter”