Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Prophet (peace and blessings be upon him) passed by two graves and he (peace and blessings be upon him) said: "These two are being punished because of tale-bearing and urine." He (peace and blessings be upon him) took a fresh palm stalk, split it into two parts, planted them on the two graves and said: "Perhaps their punishment will be lightened until they dry."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4139