peccavi

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pec·ca·vi

P0139400 (pĕ-kä′wē, -vē, -kā′vī′)n. pl. pec·ca·vis A confession of sin.
[Latin peccāvī, I have sinned, first person sing. perfect tense of peccāre, to sin; see peccant.]

peccavi

(pɛˈkɑːviː) n, pl -vis (Literary & Literary Critical Terms) a confession of guilt[C16: from Latin, literally: I have sinned, from peccāre]