Interest

As to thy question concerning interest and profit on gold and silver . . . Many people stand in need of this. Because if there were no prospect for gaining interest, the affairs of men would suffer collapse or dislocation. One can seldom find a person who would manifest such consideration towards his fellow-man, his countryman or towards his own brother and would show such tender solicitude for him as to be well-disposed to grant him a loan on benevolent terms. [Such loans as bear no interest and are repayable whenever the borrower pleases] Therefore as a token of favour towards men We have prescribed that interest on money should be treated like other business transactions that are current amongst men.

Bahá’u’lláh, Tablets of Bahá’u’lláh, p. 132-133

He hath now made interest on money lawful, even as He had made it unlawful in the past. Within His grasp He holdeth the kingdom of authority. He doeth and ordaineth. He is in truth the Ordainer, the All-Knowing.

Bahá’u’lláh, Tablets of Bahá’u’lláh, p. 132-133

Many ecclesiastics in Persia have, through innumerable designs and devices, been feeding on illicit gains obtained by usury. They have contrived ways to give its outward form a fair semblance of lawfulness. They make a plaything of the laws and ordinances of God, but they understand not. However, this is a matter that should be practised with moderation and fairness. Our Pen of Glory hath, as a token of wisdom and for the convenience of the people, desisted from laying down its limit. Nevertheless We exhort the loved ones of God to observe justice and fairness, and to do that which would prompt the friends of God to evince tender mercy and compassion towards each other. He is in truth the Counsellor, the Compassionate, the All-Bountiful. God grant that all men may be graciously aided to observe that which the Tongue of the One true God hath uttered. And if they put into practice what We have set forth, God -- exalted be His glory -- will assuredly double their portion through the heaven of His bounty. Verily He is the Generous, the Forgiving, the Compassionate.

Bahá’u’lláh, Tablets of Bahá’u’lláh, p. 132

We have, according to the text of the Book, forbidden unto all men the practice of usury.

Bahá’u’lláh, The Summons of the Lord of Hosts, p. 200