It is narrated from Sayyiduna Mu'awiyah bin Haydah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "On the Day of Resurrection you will be summoned with your mouths sealed." Then he said: "Indeed, the first thing of each of you that will make things plain is his thigh and his palm."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17022