Translated from the Greek original by Frederick Crombie.
For on the day after the angel of God appeared to Cornelius, suggesting to him "to send to Joppa, to Simon surnamed Peter," Peter "went up into the upper room to pray about the sixth hour. And he became very hungry, and would have eaten: but while they made ready he fell into a trance, and saw heaven opened, and a certain vessel descending unto him, as it had been a great sheet knit at the four corners, and let down to the earth; wherein were all manner of four-footed beasts, and creeping things of the earth, and fowls of the air. And there came a voice to him, Rise, Peter; kill, and eat. But Peter said, Not so, Lord; for I have never eaten anything that is common or unclean. And the voice spake unto him again the second time, What God hath cleansed, that call thou not common."  Now observe how, by this instance, Peter is represented as still observing the Jewish customs respecting clean and unclean animals. And from the narrative that follows, it is manifest that he, as being yet a Jew, and living according to their traditions, and despising those who were beyond the pale of Judaism, stood in need of a vision to lead him to communicate to Cornelius (who was not an Israelite according to the flesh), and to those who were with him, the word of faith.
 Cf. Acts x. 9-15.
Reference address : https://www.ellopos.net/elpenor/greek-texts/fathers/origen/against-celsus.asp?pg=84