It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "Whoever is shown kindness should repay it. If he has nothing with which to repay it, then he should at least say good words in praise of the one who did the kindness. Thus, whoever has said good words has expressed gratitude for it, and whoever conceals that kindness has shown ingratitude. And whoever displays a quality for himself which he does not possess has put on two garments of falsehood."