Reference for Pesachim 186:8

הזיד בראשון ושגג בשני לרבי ולר' נתן מחייבי לרבי חנניא בן עקביא פטור

If [he neglected] the first deliberately but the second unwittingly: according to Rabbi and R'Nathan he is culpable; according to R'Hanania B''Akabia, he is not culpable. If [he neglected] the first unwittingly but the second deliberately: according to Rabbi he is culpable; according to R'Nathan and R'Hanania B''Akabia he is not culpable.

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