if a friend ask you to lend her/him money, would you add-up an interest?

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would you? and if it took a long time since she borrowed from you,? i won't do that,, coz it happens everytime to me, even if they took them a long time to give back the money, and i don't demand them to pay me back, just because i want to,,no, to help friends who are in need, is the best move that we can do for thanking the good LORD for all the blessings in life!