Commentaire sur Les Psaumes 51:6

Against You alone have I sinned Therefore, it is in Your power to forgive [me]. Even in my sin against Uriah, I sinned against You, for You warned against the matter.

in order that You be justified in Your conduct like במנהגך, in Your conduct. I had the strength to overpower my evil inclination, but, so that they should not say, “The servant overpowered his master,”for I said to You (Ps. 26: 2), “Test me, O Lord, and try me,” and You tested me and I was not found perfect, in order that You should be justified and not I (Sanh. 107a). Another explanation: in order that You be justified in Your conduct If You forgive me, You will be justified in Your judgment against all the wicked who do not repent, so that they will not be able to say, “If we had repented, it would not have availed us.”