Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Abdullah bin Hanzalah Rahib (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever knowingly consumes one dirham of usury, in the sight of Allah, (this crime) is more severe than committing adultery thirty-six times."