Heb 13:18

“"Pray for us" (he says); "for we trust we have a good conscience among all, willing to live honestly." Thou seest that he used these apologies, as writing to persons grieved with him, as to those who turned away, who were disposed as towards a transgressor, not enduring even to hear his name? Inasmuch then as he asked from those who hated him what all others ask from those who love them (their prayers for him), therefore he here introduces this; saying, "We trust that we have a good conscience." For do not tell me of accusations; our conscience, he says, in nothing hurts us; nor are we conscious to ourselves that we have plotted against you. "For we trust," he says, "that we have a good conscience among all," not among the Gentiles only, but also among you. We have done nothing with deceitfulness, nothing with hypocrisy: for it was probable that these calumnies were reported respecting him. "For they have been informed concerning thee" (it is said) "that thou teachest apostasy." (Acts xxi. 21.) Not as an enemy, he means, nor as an adversary I write these things, but as a friend. And this he shows also by what follows.”

“Since some slandered the apostle, as though he teaches apostasy from the law, many of the Jews were hostile toward him. Therefore he did not indicate his name at the beginning of the epistle, since they could not even bear to hear of him. So then, defending himself before them, he first of all asks them to pray for him, which we usually ask of friends; then he also reveals his innocence. For among all people, not only among the Gentiles, but also among you, we did nothing with hypocrisy, our conscience is clear and we know that we did not plot evil against you, did nothing wrong to you, did not slander you. That is, striving to lead a life carefully and blamelessly. And the very thing that I say, that the law has no power, is not the speech of a foe and adversary. For I rather introduce the fulfillment of the law and show that the "shadow" has received its end. So then, is this apostasy? Am I not your benefactor when I lead you to perfection, completely drawing you away from the shadow and the infantile disposition?”

“Then he says, pray for us. Thus does the Apostle tell them how they should act in regard to him: for he asks that they pray for him. The same is had in Romans (15:30): 'I beseech you, therefore, brethren, through our Lord Jesus Christ and by the charity of the Holy Spirit, that you help me in your prayers for me to God,' because, as a Gloss says: 'It is impossible,' i.e., very difficult, 'for the prayers of many not to be heard'; 'If two of you shall consent upon the earth, concerning anything whatsoever they shall ask, it shall be done to them by my Father in Heaven' (Mt. 18:19). Therefore, in asking that they pray for him the Apostle, who was certain that he was acceptable to God, was striking at the pride of those who scorned asking prayers of others, as a Gloss says. He gives the reason for this request when he says, we are sure that we have a clear conscience. This can be taken in two ways: first, in relation to those whose prayers he is asking, because, since the Apostle did not preach to the Jews but only to the Gentiles, it does not seem that he was acceptable to them. Hence, they could excuse themselves from granting his request. Therefore he says, as though excusing himself, that he is not aware of anything but seeking their good; hence, he says, we are sure that we have a clear conscience, desiring to act honorably in all things. In this we are given to understand that he intends to help them as much as he is able. But because a good conscience is from God alone, he attributes it to the confidence he has in God. Or it can be referred to the Apostle himself, because, since he would not preach to the Jews, he did not seem worthy of their prayers: for the Lord would not hear them, since he seemed to be an enemy of their faith, as it says in Jeremiah (7:16): 'Do not pray for this people, nor take to you praise and supplication for them: and do not withstand me: for I will not hear you.' Therefore, the Apostle removes this, saying: Pray for us, because we have no consciousness of any sin or evil deed, but we are sure that we have a clear conscience. He does not say, 'I am certain,' because who understands sins? 'A man does not know whether he is worthy of love or hatred' (Ec. 9:1); 'I am not conscious of anything, but I am not thereby justified' (1 Cor. 4:4). Therefore, we have a clear conscience, desiring to act honorably in all things, therefore your prayers should benefit me.”

“"Pray for us." Because some were slandering the apostle, as teaching apostasy from the law, many of the Hebrews had a strong distaste toward him; therefore, Paul did not even place his name at the beginning of the letter, so that they would not find the name of Paul and then not read the letter. Therefore, he now defends himself to them. And first, he asks them to pray for him, as we are accustomed to ask from those who love us. Then he also shows himself to be innocent; for we are sure, he says, that we have a clear conscience; that is, we have done nothing with hypocrisy, but our conscience is clear, and we are not aware that we have plotted against you, or have done anything evil against you, or have slandered you. "desiring to act honorably in all things." That is, in all things, living without offense and without causing scandal; not proclaiming a departure from the law, as some slander, but rather transitioning from the letter and the shadow to the spirit and the truth (Jn. 4:24); which is not a departure, but rather a fulfillment and promotion of the law.”