It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that if a person buys a garment for ten dirhams and one dirham of it is unlawful, then as long as that garment remains on his body, none of his prayers will be accepted. After this, Sayyiduna Ibn Umar (may Allah be pleased with them both) put his fingers in his ears and said: "Let these ears become deaf if I did not hear the Prophet (peace and blessings be upon him) say this."