Acts 11:15

And as I began to speak
, That is, whilst he was speaking; the word "begin" with Luke, both, in his Gospel and in this history, is used not to denote the time or order of any action, but the thing itself; as in ( Luke 4:21 ) ( 20:9 ) ( Acts 1:1 ) for otherwise it was towards the close, and not at the beginning of his discourse, that what follows happened:

the Holy Ghost fell on them, as on us at the beginning;
of our ministry, since the death, resurrection, and ascension of Christ; meaning on the day of Pentecost, and that the Holy Ghost fell on Cornelius and those that were with him, in a like visible form, and in the same kind of gifts, as speaking with tongues, as on them.