Relying on some deeds, forgetting others
It is reported that Abû Ayyûb Al-Ansârî – Allâh be pleased with him – said, “A person might do a single good deed, rely on it and forget sins that he regards insignificant, but then meet Allâh (on the Day of Judgment) with those sins surrounding him. And a man might commit a sin, but never stop fearing its consequences, until he meets Allâh safe and sound.”
Al-Hâfidh Ibn Hajr, Fath Al-Bârî, references this narration to Asad b. Mûsâ’s Al-Zuhd. A slightly different wording is reported by Ibn Al-Mubârak in Al-Zuhd wa Al-Raqâ`iq Vol.1 p170.