Confess! Study text #2. From Maimonides Commandments, positive #73, Sefaria.org

... He commanded us to confess the transgressions and sins that we have done before God and to say them together with [our] repentance. And that is confession. And its intent is that one say, "Please, Lord, I have sinned, I have transgressed, I have rebelled and I have done such and such." And he should prolong the statement and request forgiveness about this matter according to the polish of his speech. ... And that is His saying, "Speak to the children of Israel [saying], a man or woman who commits from any of the sins of man [...]. And they shall confess the sins that they did" (Numbers 5:6-7).

... And there it says, "'From any of the sins of man' - for theft, for robbery, for evil speech; 'to commit a trespass' - to include one who swears falsely and a blasphemer; 'and be guilty' - to include all those guilty of death penalties. It might be even those who are killed according to the testimony of colluding ones. ...

... "It might be that when they bring their sacrifices, they confess; when they do not bring their sacrifices, they do not confess. [Hence] we learn to say, 'Speak to the children of Israel [...]. And they shall confess.'

... But still, the understanding of confession is only in the Land [of Israel]. From where [do we know], also in the diaspora? [Hence] we learn to say, 'their iniquities [...] and the iniquities of their fathers' (Leviticus 26:40)."

... And likewise did Daniel say, "To You, Lord, is justice, etc." (Daniel 9:7). Behold that which we have mentioned has been made clear to you - that confession is a separate obligation; and that it is an obligation for the sinner for every sin that he did. Whether in the Land or outside of the Land; whether he brought a sacrifice or did not bring a sacrifice - he is obligated to confess, as it is stated, "And they shall confess for their iniquities."...