In The Name of Allah, The Most Merciful, The Bestower of Mercy.
Imam As-Sadi [may Allah have mercy upon him] said:
Allah encouraged acts of kindness that would bring the doer a reward, such as when a person’s wealth is returned to him or something is given to him in exchange (without usury, blackmail, bribery, demanding more in return, and so on). This is one of the loftiest types of gains that do not harm the person, such as loans that are repaid with the same type of wealth or other items of comparable value, lending property to someone so that he can benefit from it and return it in its original form and what is similar. There are – in this affair – countless gains related to welfare, fulfilling needs, relieving hardship, and performing good and righteous deeds. The person’s wealth is returned to him, while he gains a great reward from his Lord (Allah), and he spends in a kind and good manner for his Muslim brethren, along with what follows from that of goodness, blessings, a heart filled with tranquillity, attainment of harmony, and strong love between people. (footnote a) (1)
The Prophet [peace and blessings of Allah be upon him] said, “There is no Muslim who lends something to another Muslim twice, but it will be like giving charity once”. [Sunan Ibn Maajah 2430]
Once the people of Medina were frightened, so the Prophet [peace and blessings of Allaah be upon him] borrowed a horse from Abu Talha [may Allaah be pleased with him] called Al-Mandub, and rode it. When he came back he said, “We have not seen anything (to be afraid of), but the horse was very fast (having an energy as inexhaustible as the water of the sea). [Bukhari 2627. Muslim 2307]
Ref 1: An Excerpt from “Ad-Durra Al-Mukhtasar Fee Mahaasin Deen Al-Islaamiy” page 32-33. slightly paraphrased