Tripartate Tractate on Redemption and the Firstborn

Not only do humans need redemption, but also the angels, too, need redemption, along with the image and the rest of the Pleromas of the aeons and the wondrous powers of illumination. So that we might not be in doubt in regard to the others, even the Son himself, who has the position of redeemer of the Totality, needed redemption as well, - he who had become man, - since he gave himself for each thing which we need, we in the flesh, who are his Church. Now, when he first received redemption from the word which had descended upon him, all the rest received redemption from him, namely those who had taken him to themselves. For those who received the one who had received (redemption) also received what was in him.

Among the men who are in the flesh redemption began to be given, his first-born, and his love, the Son who was incarnate, while the angels who are in heaven asked to associate, so that they might form an association with him upon the earth. Therefore, he is called "the Redemption of the angels of the Father," he who comforted those who were laboring under the Totality for his knowledge, because he was given the grace before anyone else.