مَا أَنَا قُلْتُ هَذَا
I was not the one who said this.
After the negative particle «mā», the pronoun anā appears before the verb «qultu». In the relevant context the construction focuses the denial on attributing the act of saying to the speaker, rather than simply asserting silence in every respect.
It can correct an assumption about who said the particular thing. The exact implication about another speaker remains dependent on the surrounding context and the contrast being made.