I asked Ibn Umar, may Allah be pleased with them both, "When should I throw the pebbles at the Jamarat?"He replied, "Throw them when your imam throws them."I repeated the question to him, and he said, "We used to watch for the right moment, and when the sun passed its zenith, we would throw."
حدثنا أبو نعيم حدثنا مسعر
سألت ابن عمر رضي الله عنهما متى أرمي الجمار قال إذا رمى إمامك فارمه فأعدت عليه المسألة قال كنا نتحين فإذا زالت الشمس رمينا