Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates: You people do deeds that are lighter than a hair in your eyes, yet in the blessed time of the Prophet (peace and blessings be upon him) we used to count them among the destructive deeds.
Ahmad recorded it, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب التوبة / 17464