2 Maccabees 12
39 On the next day, as by that time it had become necessary, Judas and his men went to take up the bodies of the fallen and to bring them back to lie with their kinsmen in the sepulchres of their fathers. 40 Then under the tunic of every one of the dead they found sacred tokens of the idols of Jam′nia, which the law forbids the Jews to wear. And it became clear to all that this was why these men had fallen. 41 So they all blessed the ways of the Lord, the righteous Judge, who reveals the things that are hidden; 42 and they turned to prayer, beseeching that the sin which had been committed might be wholly blotted out. And the noble Judas exhorted the people to keep themselves free from sin, for they had seen with their own eyes what had happened because of the sin of those who had fallen. 43 He also took up a collection, man by man, to the amount of two thousand drachmas of silver, and sent it to Jerusalem to provide for a sin offering. In doing this he acted very well and honorably, taking account of the resurrection. 44 For if he were not expecting that those who had fallen would rise again, it would have been superfluous and foolish to pray for the dead. 45 But if he was looking to the splendid reward that is laid up for those who fall asleep in godliness, it was a holy and pious thought. Therefore he made atonement for the dead, that they might be delivered from their sin.
I would post an OT verse on the subject of making offerings for the dead, except there are none. All OT offerings are made by the living for the living. From the NT, we get ...
[Heb 9:27 NASB] 27 And inasmuch as it is appointed for men to die once and
after this [comes] judgment,
[Jhn 3:16-18 NASB] 16 "For God so loved the world, that He gave His only begotten Son, that
whoever believes in Him shall not perish, but have eternal life. 17 "For God did not send the Son into the world to judge the world, but that the world might be saved through Him. 18 "He who believes in Him is not judged;
he who does not believe has been judged already, because he has not believed in the name of the only begotten Son of God.
Which directly contradicts the notion of buying forgiveness for the dead.
Even the books that you want to include in scripture, acknowledge that they were not written by prophets of God:
1 Maccabees 9: 27 So there was great distress in Israel, such as had not been since the time that prophets ceased to appear among them.