Neither a borrower or a lender be (Prov.)
Non chieder né dar denaro in prestito (Lett.)
Non chieder né dar denaro in prestito (Lett.)
Origin
Words of Lord Polonius in Shakespeare's Hamlet (Act I, scene III):
Neither a borrower nor a lender be;
For loan oft loses both itself and friend,
And borrowing dulls the edge of husbandry