Musnad Abu Ya'la al-Mawsili 152:45

Muhammad ibn Abi Bakr narrated to us, Yahya ibn Sa’id narrated to us, from Sufyan, from Mansur and Sulayman, from Abu Wa’il, from ‘Abdullah, who said: A man came to the Prophet, may Allah bless him and grant him peace, and said: "Shall we be held accountable for what we did during the Jahiliyyah (pre-Islamic period)?" He said: "If you do good in Islam, you will not be held accountable for it; but if you do evil in Islam, you will be held accountable for the first and the last."