He that doth not lend doth lose his friend.

The saying warns that refusing a friend's request for a loan may damage the relationship. It presents lending as a test of friendship and suggests that help withheld in a moment of need can cost goodwill or companionship.

It highlights the social pressure attached to saying no, not a rule that every request must be granted. A friend may have valid reasons to decline, and generosity should not require an unsafe or unaffordable loan.

Use it when discussing the pressure friends may feel to lend money or possessions, especially when refusal could strain a relationship. It can introduce discussion of generosity, personal limits, and expectations of mutual support, without implying that anyone must lend beyond their means.