G1524–εἴσειμι–eiseimi

He then, seeing Peter and John going into the Temple, made a request to them.

εἰσιέναι eisienai “to enter”

And on the day after, Paul went with us to James, and all the rulers of the church were present.

εἰσῄει eisēei “was going in”

Then Paul took the men, and on the day after, making himself clean with them, he went into the Temple, giving out the statement that the days necessary for making them clean were complete, till the offering was made for every one of them.

εἰσῄει eisēei “was entering”

Now while these things were in existence, the priests went into the first Tent at all times, for prayer and the making of offerings.

εἰσίασιν eisiasin “enter”