“Quran: Surah Al-Imran: Ayat 130-132”
"O you who believe! eat not Riba doubled and multiplied, but fear Allah
that you may be successful. And fear the fire, which us prepared for the disbelievers. And obey Allah and the messenger that you may obtain mercy."
"Sahih Al Bukhari"
Muhammad bin Ismail bin Zahabi in his "Kitab-ul-Kabair" states that Riba is a major sin and this is substantiated from the hadith that states: Narated by Abu Huraira: The Prophet (PBUH) said, "Avoid the seven great destructive sins." The people enquire, "O Allah's Apostel! What are they? "He said, "to join others in worship along with Allah, to practice sorcery, to kill the life which Allah has forbidden except for just cause (according to Islamic Law), to eat up Riba (usury), to eat up an orphan's wealth, to give back the enemy and fleeing from the battlefield at the time of fighting, and to accuse chaste women, who never think of anything touching chastity and are good believers.
"Narrated by Abu Jahaifa: "The Prophet (PBUH) cursed the lady who practices tattooing and the one who gets herself tattooed, and one who eats (takes) Riba (usury) and the one who gives it.
"Ibn Majah Sahih"
Abu Huraira said "that the Messenger of Allah (PBUH) said: "Riba is seventy types, the least of which is equal to one having sexual intercourse with his mother".
"Musnad Ahmed"
Abdullah ibn Hanzala reported "that the Prophet (PBUH) said: "knowingly consuming a dirham of Riba is worse for a man than committing adultery thirty six times".
"Sahih Muslim"
Jabir reported "that the Messenger of Allah (PBUH) cursed "the one who consumes Riba, the one who gives it to others, the one who writes it down and the one who witnesses it." He said> "They are all the same".
"Sunan Abu Dawood"
Narrated by by Abdullah ibn Mas'ud: The Apostel of Allah (PBUH) cursed the one who accepted usury, the one who paid it, the witness to it, and the one who recorded it."