Silsilah as-Sahihah 2316 — Shariah determines the gravity of sins

It is narrated from Sayyiduna Abu Sa'id (may Allah be pleased with him), he says: Indeed, you perform such deeds which, in your view, are finer than a hair (i.e., you consider them very insignificant), whereas during the blessed era of the Messenger of Allah (peace and blessings be upon him), we used to count them among the destructive matters.