New Testament

1 Peter 4:6

4 So they are astonished when you do not rush with them into the same flood of wickedness, and they vilify you. 5 They will face a reckoning before Jesus Christ who stands ready to judge the living and the dead. 6 Now it was for this very purpose that the gospel was preached to those who are now dead, so that though they were judged in the flesh by human standards they may live spiritually by God’s standards. 7 For the culmination of all things is near. So be self-controlled and sober-minded for the sake of prayer. 8 Above all keep your love for one another fervent because love covers a multitude of sins.

Date: 60-65 C.E. (If authentic), 80-90 C.E. (If anymous)
* Dates are based on scholarly estimates

Origen Contra Celsum 2.43

Against Celsus

Celsus next addresses to us the following remark: You will not, I suppose, say of him, that, after failing to gain over those who were in this world, he went to Hades to gain over those who were there. But whether he like it or not, we assert that not only while Jesus was in the body did He win over not a few persons merely, but so great a number, that a conspiracy was formed against Him on account of the multitude of His followers; but also, that when He became a soul, without the covering of the body, He dwelt among those souls which were without bodily covering, converting such of them as were willing to Himself, or those whom He saw, for reasons known to Him alone, to be better adapted to such a course.

Date: 248 C.E.
* Dates are based on scholarly estimates