It is narrated from a Companion (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) in the plain of Mina, seated the people in their places and while delivering a sermon said, "Let the Muhajirun settle here," and he pointed to the right side of the Qiblah, "and let the Ansar settle here," and he pointed to the left side of the Qiblah. Then the people settled around them. Then the Noble Prophet (peace and blessings be upon him) taught them the rites of Hajj, which opened the ears of the people of Mina, and everyone in their own encampment could hear the voice of the Noble Prophet (peace and blessings be upon him). I also heard the Noble Prophet (peace and blessings be upon him) saying, "Pelt the Jamarat with pebbles like the size of date stones."
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 23177
Hadith Gradingحکم دارالسلام:إسناده ضعيف دون قوله: ارموا الجمرة بمثل حصى الخذفه فهو صحيح لغيره، وقد اختلف فى هذا الإسناد على حمد الأعرج