Indeed, those who believe and do righteous deeds and establish prayer and give zakah will have their reward with their Lord, and there will be no fear concerning them, nor will they grieve.

THE HOLY QURAN
Surah Al-Baqarah, verses 277.

And [for] their taking of usury while they had been forbidden from it, and their consuming of the people's wealth unjustly. And we have prepared for the disbelievers among them a painful punishment.

THE HOLY QURAN
Surah Al-Nisa', verse 161

O you who have believed, do not consume usury, doubled and multiplied, but fear Allah that you may be successful.

THE HOLY QURAN
Surah Al 'Imran, verses 130.

Allah destroys interest and gives increase for charities. And Allah does not like every sinning disbeliever.

THE HOLY QURAN
Surah al-Baqarah, verses 276.

Verily Allah, Mighty and Exalted, curses the usurer, his agent, his scribe and his two witnesses.

PROPHET MUHAMMAD (P.B.U.H)
Amali al-Saduq, p. 346, no.1

During my Night-Journey up to the heavens, I was taken to a people whose bellies were as large as houses and contained serpents that could be seen from outside their bellies. I asked, 'Who are these people, O Gabriel?' He replied, 'They are the usurers.

PROPHET MUHAMMAD (P.B.U.H)
Kanz Al-’Ummal, no. 31857

Engage yourself firstly in communal relations with people, then the law, and subsequently trading, for by Allah, usury creeps into this community more discreetly than an ant creeps onto a rock.

ALI IBN ABI TALIB (A.S) Al-Kafi, v. 5, p. 150, no. 1.

The most despicable of profits is the profit earned from usury.

IMAM AL-BAQIR (A.S.)
Al-Kafi, v. 5, p. 147, no. 12